The complement system helps or “complements” the ability of antibodies and phagocytic cells to clear pathogens from an organism. It is part of the immune system called the innate immune system that is not adaptable and does not change over the course of an individual's lifetime. The complement system consists of a number of small proteins found in the blood, in general synthesized by the liver, and normally circulating as inactive precursors (pro-proteins). When stimulated by one of several triggers, proteases in the system cleave specific proteins to release cytokines and initiate an amplifying cascade of further cleavages. The end-result of this activation cascade is massive amplification of the response and activation of the cell-killing membrane attack complex. Over 30 proteins and protein fragments make up the complement system. Three biochemical pathways activate the complement system: the classical complement pathway, the alternative complement pathway, and the lectin pathway.


Anti-infection >
Arenavirus Bacterial CMV Enterovirus Filovirus Fungal HBV HCV HIV HSV Influenza Virus Parasite Reverse Transcriptase RSV SARS-CoV
Antibody-drug Conjugate >
ADC Cytotoxin ADC Linker Drug-Linker Conjugates for ADC PROTAC-linker Conjugate for PAC
Apoptosis >
Apoptosis Bcl-2 Family c-Myc Caspase DAPK Ferroptosis IAP MDM-2/p53 PKD RIP kinase Survivin Thymidylate Synthase TNF Receptor
Autophagy >
Autophagy LRRK2 ULK Mitophagy
Cell Cycle/DNA Damage >
Antifolate APC ATM/ATR Aurora Kinase Casein Kinase CDK Checkpoint Kinase (Chk) CRISPR/Cas9 Deubiquitinase DNA Alkylator/Crosslinker DNA-PK DNA/RNA Synthesis Eukaryotic Initiation Factor (eIF) G-quadruplex Haspin Kinase HDAC HSP IRE1 Kinesin LIM Kinase (LIMK) Microtubule/Tubulin Mps1 Nucleoside Antimetabolite/Analog p97 PAK PARP PERK Polo-like Kinase (PLK) PPAR RAD51 ROCK Sirtuin SRPK Telomerase TOPK Topoisomerase Wee1
Cytoskeleton >
Arp2/3 Complex Dynamin Gap Junction Protein Integrin Kinesin Microtubule/Tubulin Mps1 Myosin PAK
Epigenetics >
AMPK Aurora Kinase DNA Methyltransferase Epigenetic Reader Domain HDAC Histone Acetyltransferase Histone Demethylase Histone Methyltransferase JAK MicroRNA PARP PKC Sirtuin Protein Arginine Deiminase
GPCR/G Protein >
5-HT Receptor Adenosine Receptor Adenylate Cyclase Adiponectin Receptor Adrenergic Receptor Angiotensin Receptor Bombesin Receptor Bradykinin Receptor Cannabinoid Receptor CaSR CCR CGRP Receptor Cholecystokinin Receptor CRFR CXCR Dopamine Receptor EBI2/GPR183 Endothelin Receptor GHSR Glucagon Receptor Glucocorticoid Receptor GNRH Receptor GPCR19 GPR109A GPR119 GPR120 GPR139 GPR40 GPR55 GPR84 Guanylate Cyclase Histamine Receptor Imidazoline Receptor Leukotriene Receptor LPL Receptor mAChR MCHR1 (GPR24) Melatonin Receptor mGluR Motilin Receptor Neurokinin Receptor Neuropeptide Y Receptor Neurotensin Receptor Opioid Receptor Orexin Receptor (OX Receptor) Oxytocin Receptor P2Y Receptor Prostaglandin Receptor Protease-Activated Receptor (PAR) Ras RGS Protein Sigma Receptor Somatostatin Receptor TSH Receptor Urotensin Receptor Vasopressin Receptor Melanocortin Receptor
Immunology/Inflammation >
Aryl Hydrocarbon Receptor CCR Complement System COX CXCR FLAP Histamine Receptor IFNAR Interleukin Related IRAK MyD88 NO Synthase NOD-like Receptor (NLR) PD-1/PD-L1 PGE synthase Salt-inducible Kinase (SIK) SPHK STING Thrombopoietin Receptor Toll-like Receptor (TLR) Arginase
JAK/STAT Signaling >
EGFR JAK Pim STAT
MAPK/ERK Pathway >
ERK JNK KLF MAP3K MAP4K MAPKAPK2 (MK2) MEK Mixed Lineage Kinase MNK p38 MAPK Raf Ribosomal S6 Kinase (RSK)
Membrane Transporter/Ion Channel >
ATP Synthase BCRP Calcium Channel CFTR Chloride Channel CRAC Channel CRM1 EAAT2 GABA Receptor GlyT HCN Channel iGluR Monoamine Transporter Monocarboxylate Transporter Na+/Ca2+ Exchanger Na+/HCO3- Cotransporter Na+/K+ ATPase nAChR NKCC P-glycoprotein P2X Receptor Potassium Channel Proton Pump SGLT Sodium Channel TRP Channel URAT1
Metabolic Enzyme/Protease >
15-PGDH 5 alpha Reductase 5-Lipoxygenase Acetyl-CoA Carboxylase Acyltransferase Adenosine Deaminase Adenosine Kinase Aldehyde Dehydrogenase (ALDH) Aldose Reductase Aminopeptidase Angiotensin-converting Enzyme (ACE) ATGL ATP Citrate Lyase Carbonic Anhydrase Carboxypeptidase Cathepsin CETP COMT Cytochrome P450 Dipeptidyl Peptidase Dopamine β-hydroxylase E1/E2/E3 Enzyme Elastase Enolase FAAH FABP Factor Xa Farnesyl Transferase Fatty Acid Synthase (FAS) FXR Glucokinase GSNOR Gutathione S-transferase HCV Protease Hexokinase HIF/HIF Prolyl-Hydroxylase HIV Integrase HIV Protease HMG-CoA Reductase (HMGCR) HSP Indoleamine 2,3-Dioxygenase (IDO) Isocitrate Dehydrogenase (IDH) Lactate Dehydrogenase LXR MAGL Mineralocorticoid Receptor Mitochondrial Metabolism MMP Nampt NEDD8-activating Enzyme Neprilysin PAI-1 PDHK PGC-1α Phosphatase Phosphodiesterase (PDE) Phospholipase Procollagen C Proteinase Proteasome Pyruvate Kinase RAR/RXR Renin ROR Ser/Thr Protease SGK Stearoyl-CoA Desaturase (SCD) Thrombin Tryptophan Hydroxylase Tyrosinase Xanthine Oxidase
Neuronal Signaling >
5-HT Receptor AChE Adenosine Kinase Amyloid-β Beta-secretase CaMK CGRP Receptor COMT Dopamine Receptor Dopamine Transporter FAAH GABA Receptor GlyT iGluR Imidazoline Receptor mAChR Melatonin Receptor Monoamine Oxidase nAChR Neurokinin Receptor Opioid Receptor Serotonin Transporter γ-secretase
NF-κB >
NF-κB IKK Keap1-Nrf2 MALT1
PI3K/Akt/mTOR >
Akt AMPK ATM/ATR DNA-PK GSK-3 MELK mTOR PDK-1 PI3K PI4K PIKfyve PTEN
PROTAC >
PROTAC E3 Ligase Ligand-Linker Conjugate Ligand for E3 Ligase PROTAC Linker PROTAC-linker Conjugate for PAC
Protein Tyrosine Kinase/RTK >
Ack1 ALK Bcr-Abl BMX Kinase Btk c-Fms c-Kit c-Met/HGFR Discoidin Domain Receptor DYRK EGFR Ephrin Receptor FAK FGFR FLT3 IGF-1R Insulin Receptor IRAK Itk PDGFR PKA Pyk2 ROS Src Syk TAM Receptor Trk Receptor VEGFR
Stem Cell/Wnt >
Casein Kinase ERK Gli GSK-3 Hedgehog Hippo (MST) JAK Notch Oct3/4 PKA Porcupine ROCK sFRP-1 Smo STAT TGF-beta/Smad Wnt YAP β-catenin γ-secretase
TGF-beta/Smad >
TGF-beta/Smad PKC ROCK TGF-β Receptor
Vitamin D Related >
VD/VDR
Others >
Androgen Receptor Aromatase Estrogen Receptor/ERR Progesterone Receptor Thyroid Hormone Receptor Others

Factor B-IN-5

Factor B-IN-5 (Example 5 target compound) is a potent complement factor B inhibitor, with an IC50 of 1.2 μM. Factor B-IN-5 can be used for the research of diseases related to inflammation and immunity[1].

  • CAS Number: 2760789-22-6
  • MF: C27H32N2O4
  • MW: 448.55
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Avacincaptad pegol sodium

Avacincaptad pegol (ARC1905) is is an anti-C5 RNA aptamer that inhibits the cleavage of complement factor 5 (C5) into C5a and C5b. Avacincaptad pegol is being used for the study of age-related macular degeneration (AMD).

  • CAS Number: 1491144-00-3
  • MF:
  • MW: 53500.00
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Compstatin trifluoroacetate salt

Compstatinis is a 13-residue cyclic peptide, and a potent inhibitor of the complement system.

  • CAS Number: 206645-99-0
  • MF: C66H99N23O17S2
  • MW: 1550.77000
  • Catalog: Peptides
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Pexelizumab

Pexelizumab (h5G1. 1-SC) is a humanized scFv monoclonal antibody directed against the C5 complement component. Pexelizumab inhibits apoptosis and leukocyte infiltration. Pexelizumab can be used for the research of cerebral IR injury and myocardial infarction[1][2].

  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

LNP023

LNP023 is a highly potent factor B (FB) inhibitor with an IC50 value of 10 nM. LNP023 shows direct, reversible, and high-affinity binding to human FB (KD=7.9 nM)[1].

  • CAS Number: 1644670-37-0
  • MF: C25H30N2O4
  • MW: 422.52
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Gefurulimab

Gefurulimab (ALXN-1720) is a human-derived bispecific antibody against complement C5 and albumin that binds C5 and blocks its activation[1].

  • CAS Number: 2456407-94-4
  • MF:
  • MW:
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Avdoralimab

Avdoralimab (IPH 5401) is a fully human IgGκ monoclonal antibody that targets the complement C5a receptor 1 (C5aR1) that prevents its binding to C5a. Avdoralimab can be used for complement-driven inflammatory diseases and solid tumours research[1].

  • CAS Number: 2226393-85-5
  • MF:
  • MW:
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

ADH-503

ADH-503 ((Z)-Leukadherin-1 choline) is an orally active and allosteric CD11b agonist. ADH-503 leads to the repolarization of tumorassociated macrophages, reduction in the number of tumor-infiltrating immunosuppressive myeloid cells, and enhances dendritic cell responses[1].

  • CAS Number: 2055362-74-6
  • MF: C27H28N2O5S2
  • MW: 524.65
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Crovalimab

Crovalimab (SKY59; RO7112689) is a novel humanized antibody against C5 in a pH-dependent manner with KDs of 15.2 nM and 16.8 μM at pH 7.4 and 5.8, respectively. Crovalimab binds human FcRn with great affinity (KD: 17 μM at pH 6.0). Crovalimab can block cleavage of C5 by the C5 convertase and inhibite the activity of a C5 variant (p.Arg885His). Crovalimab inhibits C5b-9 formation significantly in all three complement pathways, the classical pathway (CP), lectin pathway (LP), and alternative pathway (AP). Crovalimab has the potential for paroxysmal nocturnal hemoglobinuria (PNH) and complement-mediated diseases research[1][2].

  • CAS Number: 1917321-26-6
  • MF:
  • MW:
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

PMX 53

PMX53 (Ac-Phe-cyclo(Orn-Pro-D-Cha-Trp-Arg)) is a potent C5a receptor (CD88) antagonist with IC50 of 20 nM, also is an agonist for Mas-related gene 2 (MrgX2) in human mast cells; PMX-53 (10 nM) inhibited C5a-induced Ca(2+) mobilization in HMC-1 cells, but at higher concentrations (>30 nM) it caused degranulation in LAD2 mast cells, CD34(+) cell-derived mast cells, and RBL-2H3 cells stably expressing MrgX2; inhibits zymosan-, carrageenan-, LPS- and antigen-induced hypernociception in rats.

  • CAS Number: 219639-75-5
  • MF: C47H65N11O7
  • MW: 896.089
  • Catalog: Complement System
  • Density: 1.4±0.1 g/cm3
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Pelecopan

Pelecopan (BCX9930) is a potent, selective, orally active inhibitor of complement factor D with an IC50 value of 14.3 nM. Pelecopan can target factor D to prevent both intravascular and extravascular hemolysis in PNH. Pelecopan also be used for other alternative pathway (AP) mediated diseases[1][2].

  • CAS Number: 2378380-49-3
  • MF: C23H19FN2O4
  • MW: 406.41
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

LNP023 hydrochloride

LNP023 hydrochloride is an orally bioavailable, highly potent and highly selective factor B inhibitor. LNP023 shows direct, reversible, and high-affinity binding to human factor B with a KD of 7.9 nM. LNP023 inhibits factor B with an IC50 value of 10 nM[1][2].

  • CAS Number: 1646321-63-2
  • MF: C25H31ClN2O4
  • MW: 458.98
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

L-156,602

L-156602 is a C5a receptor antagonist. L-156602 inhibits inflammation, and the migration of monocytes and neutrophils to the infiltrating site in mouse inflammatory models. L-156602 suppresses the efferent phase of delayed-type hypersensitivity (DTH)[1][2].

  • CAS Number: 125228-51-5
  • MF: C38H64N8O13
  • MW: 840.96
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

PMX 205

PMX 205 is a potent complement C5a receptor (C5aR; CD88) antagonist.

  • CAS Number: 514814-49-4
  • MF: C45H62N10O6
  • MW: 839.03700
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Ravulizumab

Ravulizumab (ALXN1210) is a humanized monoclonal antibody that specifically binds with high affinity to the human complement protein C5. Ravulizumab can be used for the research of paroxysmal nocturnal hemoglobinuria, atypical hemolytic uremic syndrome, and myasthenia gravis[1].

  • CAS Number: 1803171-55-2
  • MF:
  • MW:
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

3-Phenoxybenzaldehyde

3-Phenoxybenzaldehyde has weak complement classical pathway inhibition and hemolytic activity[1].

  • CAS Number: 39515-51-0
  • MF: C13H10O2
  • MW: 198.22
  • Catalog: Complement System
  • Density: 1.2±0.1 g/cm3
  • Boiling Point: 392.4±0.0 °C at 760 mmHg
  • Melting Point: 13 °C
  • Flash Point: 156.1±13.9 °C

AMY-101 TFA

AMY-101 TFA (Cp40 TFA), a peptidic inhibitor of the central complement component C3 (KD = 0.5 nM), inhibits naturally occurring periodontitis in non-human primates (NHPs). AMY-101 (Cp40) exhibits a favorable anti-inflammatory activity in models with COVID-19 severe pneumonia with systemic hyper inflammation[1][2].

  • CAS Number: 1789738-04-0
  • MF: C83H117N23O18S2.xC2HF3O2
  • MW:
  • Catalog: SARS-CoV
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

3-O-(2'E,4'Z-Decadienoyl)ingenol

3-O-(2'E,4'Z-Decadienoyl)ingenol is a natural diterpene that exhibits significant anticomplement activity with an IC50 of 89.5 μM[1].

  • CAS Number: 84680-59-1
  • MF: C30H42O6
  • MW: 498.651
  • Catalog: Complement System
  • Density: 1.2±0.1 g/cm3
  • Boiling Point: 635.6±55.0 °C at 760 mmHg
  • Melting Point: N/A
  • Flash Point: 201.7±25.0 °C

Factor B-IN-3

Factor B-IN-3 (Example 3 target compound) is a potent complement factor B inhibitor. Factor B-IN-3 can be used for the research of diseases related to inflammation and immunity[1].

  • CAS Number: 2760669-74-5
  • MF: C24H29N3O4
  • MW: 423.50
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

(Z)-Leukadherin-1

(Z)-Leukadherin-1 (ADH-503 free base) is an orally active and allosteric CD11b agonist. (Z)-Leukadherin-1 leads to the repolarization of tumorassociated macrophages, reduction in the number of tumor-infiltrating immunosuppressive myeloid cells, and enhances dendritic cell responses[1].

  • CAS Number: 2055362-72-4
  • MF: C22H15NO4S2
  • MW: 421.49
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Factor B-IN-2

Factor B-IN-2 (Example 1 target compound) is a potent complement factor B inhibitor, with an IC50 of 1.5 μM. Factor B-IN-2 can be used for the research of diseases related to inflammation and immunity[1].

  • CAS Number: 2760669-72-3
  • MF: C25H32N2O4
  • MW: 424.53
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

C3a receptor agonist 1

C3a receptor agonist 1 (compound benzeneacetamide) is a potent C3a receptor agonist. C3a receptor agonist 1 has the potential for the research of acute inflammation[1].

  • CAS Number: 944997-60-8
  • MF: C27H35N3O2
  • MW: 433.58600
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Danicopan

Danicopan, a selective and orally active small-molecule factor D inhibitor, inhibits alternative pathway of complement (APC) activity. Danicopan has potential to block the alternative pathway of complement in paroxysmal nocturnal hemoglobinuria (PNH) and atypical hemolytic uremic syndrome (aHUS)[1].

  • CAS Number: 1903768-17-1
  • MF: C26H23BrFN7O3
  • MW: 580.41
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Pozelimab

Pozelimab (REGN3918) is a fully human IgG4 anti-C5 monoclonal antibody. Pozelimab binds to C5 and C5 variants with high affinity and blocks complement-mediated hemolysis. Pozelimab can be used for the research of complement-mediated diseases[1].

  • CAS Number: 2096328-94-6
  • MF:
  • MW:
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Cyclosporin A-d3

Cyclosporin A-d3 is the d3-labeled Cyclosporin A (HY-B0579)[1].

  • CAS Number: 222295-76-3
  • MF: C62H108D3N11O12
  • MW: 1205.63
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

NRP1 antagonist 2

NRP1 antagonist 2 (Compound 1) is an NRP1 antagonist[1].

  • CAS Number: 483289-96-9
  • MF: C20H17ClN6OS2
  • MW: 456.97
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

NDT 9513727

NDT 9513727 is a potent, selective, orally active and competitive inverse agonist of the human C5aR (C5a receptor), with an IC50 of 11.6 nM. NDT 9513727 can be used for the research of human inflammatory diseases[1].

  • CAS Number: 439571-48-9
  • MF: C36H35N3O4
  • MW: 573.68100
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

Avacincaptad pegol

Avacincaptad pegol is a C5 complement inhibitor that may reduce inflammation-related retinal pigment epithelium (RPE) damage. Avacincaptad pegol caqn be used for the research of stargardt macular dystrophy (STGD1) and geographic atrophy (GA)[1][2].

  • CAS Number: 1613641-69-2
  • MF:
  • MW:
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: N/A
  • Melting Point: N/A
  • Flash Point: N/A

BCX 1470 (methanesulfonate)

BCX 1470 inhibits the esterolytic activity of factor D (IC50=96 nM) and C1s (IC50=1.6 nM), 3.4- and 200-fold better, respectively, than that of trypsin.IC50 Value: 96 nM (Factor D); 1.6 nM (C1s); 326 nM (Trypsin) [1]Target: Factor D; C1sBCX 1470(Thrombin inhibitor) is serine protease inhibitor.BCX 1470(Thrombin inhibitor) blocks the esterolytic and hemolytic activities of the complement enzymes Cls and factor D in vitro, also blocked development of RPA-induced edema in the rat.

  • CAS Number: 217099-44-0
  • MF: C15H14N2O5S3
  • MW: 398.47700
  • Catalog: Complement System
  • Density: N/A
  • Boiling Point: 509.9ºC at 760 mmHg
  • Melting Point: N/A
  • Flash Point: 262.2ºC

BCX 1470

BCX 1470 inhibits the esterolytic activity of factor D (IC50=96 nM) and C1s (IC50=1.6 nM), 3.4- and 200-fold better, respectively, than that of trypsin.IC50 Value: 96 nM (Factor D); 1.6 nM (C1s); 326 nM (Trypsin) [1]Target: Factor D; C1sBCX 1470(Thrombin inhibitor) is serine protease inhibitor.BCX 1470(Thrombin inhibitor) blocks the esterolytic and hemolytic activities of the complement enzymes Cls and factor D in vitro, also blocked development of RPA-induced edema in the rat.

  • CAS Number: 217099-43-9
  • MF: C14H10N2O2S2
  • MW: 302.371
  • Catalog: Complement System
  • Density: 1.5±0.1 g/cm3
  • Boiling Point: 509.9±58.0 °C at 760 mmHg
  • Melting Point: N/A
  • Flash Point: 262.2±32.3 °C