NPYR

Modify Date: 2026-06-30 22:00:50

NPYR structure	Common Name	NPYR
	CAS Number	930-55-2	Molecular Weight	100.119
	Density	1.2±0.1 g/cm3	Boiling Point	214.0±9.0 °C at 760 mmHg
	Molecular Formula	C₄H₈N₂O	Melting Point	N/A
	MSDS	N/A	Flash Point	83.3±0.0 °C
	Symbol	GHS07, GHS08	Signal Word	Warning

Summary: 1-Nitrosopyrrolidine (NPYR, CAS: 930-55-2), molecular formula C4H8N2O, molecular weight 100.119. For research-use only, not for medical or clinical usage.

This table lists Chinese names, IUPAC names and various aliases of this chemical substance.

Name	1-Nitrosopyrrolidine
Synonym	More Synonyms

This table shows physicochemical parameters including melting point, boiling point, density, solubility and optical rotation. Missing data is marked as N/A.

Density	1.2±0.1 g/cm3
Boiling Point	214.0±9.0 °C at 760 mmHg
Molecular Formula	C₄H₈N₂O
Molecular Weight	100.119
Flash Point	83.3±0.0 °C
Exact Mass	100.063660
PSA	32.67000
LogP	-0.15
Vapour Pressure	0.2±0.4 mmHg at 25°C
Index of Refraction	1.565
InChIKey	WNYADZVDBIBLJJ-UHFFFAOYSA-N
SMILES	O=NN1CCCC1
Storage condition	Refrigerator

This table provides MSDS information including hazard classification, first‑aid, fire‑fighting, spill handling, operation and storage instructions.

NPYR MSDS(Chinese)

This table summarizes toxicological test data, acute & chronic toxicity and ecological hazard parameters for this chemical.

CHEMICAL IDENTIFICATION

RTECS NUMBER :: UY1575000

CHEMICAL NAME :: Pyrrolidine, 1-nitroso-

CAS REGISTRY NUMBER :: 930-55-2

BEILSTEIN REFERENCE NO. :: 0107615

LAST UPDATED :: 199801

DATA ITEMS CITED :: 52

MOLECULAR FORMULA :: C4-H8-N2-O

MOLECULAR WEIGHT :: 100.14

WISWESSER LINE NOTATION :: T5NTJ ANO

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 900 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 125 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Subcutaneous

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 125 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - hamster

DOSE/DURATION :: 1023 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

TYPE OF TEST :: TDLo - Lowest published toxic dose

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 476 mg/kg/3.3Y-C

TOXIC EFFECTS :: Tumorigenic - Carcinogenic by RTECS criteria Liver - tumors

TYPE OF TEST :: TDLo - Lowest published toxic dose

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 3235 mg/kg/92W-C

TOXIC EFFECTS :: Tumorigenic - neoplastic by RTECS criteria Lungs, Thorax, or Respiration - tumors Liver - tumors

TYPE OF TEST :: TDLo - Lowest published toxic dose

ROUTE OF EXPOSURE :: Intraperitoneal

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 100 mg/kg/7W-I

TOXIC EFFECTS :: Tumorigenic - neoplastic by RTECS criteria Lungs, Thorax, or Respiration - tumors

TYPE OF TEST :: TDLo - Lowest published toxic dose

ROUTE OF EXPOSURE :: Subcutaneous

SPECIES OBSERVED :: Rodent - mouse

DOSE/DURATION :: 396 mg/kg/72W-I

TOXIC EFFECTS :: Tumorigenic - neoplastic by RTECS criteria Lungs, Thorax, or Respiration - tumors Liver - tumors

TYPE OF TEST :: TDLo - Lowest published toxic dose

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - hamster

DOSE/DURATION :: 465 mg/kg/52W-C

TOXIC EFFECTS :: Tumorigenic - Carcinogenic by RTECS criteria Liver - tumors

TYPE OF TEST :: TDLo - Lowest published toxic dose

ROUTE OF EXPOSURE :: Intraperitoneal

SPECIES OBSERVED :: Rodent - hamster

DOSE/DURATION :: 1602 mg/kg/25W-I

TOXIC EFFECTS :: Tumorigenic - Carcinogenic by RTECS criteria Sense Organs and Special Senses (Olfaction) - tumors Lungs, Thorax, or Respiration - tumors

TYPE OF TEST :: TDLo - Lowest published toxic dose

ROUTE OF EXPOSURE :: Unreported

SPECIES OBSERVED :: Rodent - hamster

DOSE/DURATION :: 1602 mg/kg/25W-I

TOXIC EFFECTS :: Tumorigenic - Carcinogenic by RTECS criteria Sense Organs and Special Senses (Olfaction) - tumors Lungs, Thorax, or Respiration - tumors

TYPE OF TEST :: TD - Toxic dose (other than lowest)

ROUTE OF EXPOSURE :: Intraperitoneal

SPECIES OBSERVED :: Rodent - hamster

DOSE/DURATION :: 798 mg/kg/25W-I

TOXIC EFFECTS :: Tumorigenic - neoplastic by RTECS criteria Sense Organs and Special Senses (Olfaction) - tumors Lungs, Thorax, or Respiration - tumors

TYPE OF TEST :: TD - Toxic dose (other than lowest)

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 1350 mg/kg/30W-C

TOXIC EFFECTS :: Tumorigenic - equivocal tumorigenic agent by RTECS criteria Liver - tumors

TYPE OF TEST :: TD - Toxic dose (other than lowest)

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - hamster

DOSE/DURATION :: 704 mg/kg/39W-C

TOXIC EFFECTS :: Tumorigenic - Carcinogenic by RTECS criteria Liver - tumors

TYPE OF TEST :: TD - Toxic dose (other than lowest)

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 792 mg/kg/2Y-I

TOXIC EFFECTS :: Tumorigenic - Carcinogenic by RTECS criteria Liver - tumors Tumorigenic - increased incidence of tumors in susceptible strains

TYPE OF TEST :: TD - Toxic dose (other than lowest)

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 2250 mg/kg/50W-I

TOXIC EFFECTS :: Tumorigenic - Carcinogenic by RTECS criteria Liver - tumors

TYPE OF TEST :: TD - Toxic dose (other than lowest)

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 685 mg/kg/98W-C

TOXIC EFFECTS :: Tumorigenic - Carcinogenic by RTECS criteria Liver - tumors

TYPE OF TEST :: TD - Toxic dose (other than lowest)

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 1599 mg/kg/76W-C

TOXIC EFFECTS :: Tumorigenic - Carcinogenic by RTECS criteria Liver - tumors

TYPE OF TEST :: TD - Toxic dose (other than lowest)

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 4380 mg/kg/52W-C

TOXIC EFFECTS :: Tumorigenic - Carcinogenic by RTECS criteria Liver - tumors

TYPE OF TEST :: TD - Toxic dose (other than lowest)

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - hamster

DOSE/DURATION :: 1049 mg/kg/64W-C

TOXIC EFFECTS :: Tumorigenic - Carcinogenic by RTECS criteria Liver - tumors

TYPE OF TEST :: TD - Toxic dose (other than lowest)

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 4033 mg/kg/62W-C

TOXIC EFFECTS :: Tumorigenic - Carcinogenic by RTECS criteria Liver - tumors

TYPE OF TEST :: Specific locus test

TYPE OF TEST :: DNA damage

MUTATION DATA

TYPE OF TEST :: Unscheduled DNA synthesis

TEST SYSTEM :: Rodent - hamster Liver

DOSE/DURATION :: 100 umol/L

REFERENCE :: ENMUDM Environmental Mutagenesis. (New York, NY) V.1-9, 1979-87. For publisher information, see EMMUEG. Volume(issue)/page/year: 5,1,1983 *** REVIEWS *** IARC Cancer Review:Animal Sufficient Evidence IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man. (WHO Publications Centre USA, 49 Sheridan Ave., Albany, NY 12210) V.1- 1972- Volume(issue)/page/year: 17,313,1978 IARC Cancer Review:Human No Adequate Data IMEMDT IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man. (WHO Publications Centre USA, 49 Sheridan Ave., Albany, NY 12210) V.1- 1972- Volume(issue)/page/year: 17,313,1978 IARC Cancer Review:Group 2B IMSUDL IARC Monographs, Supplement. (WHO Publications Centre USA, 49 Sheridan Ave., Albany, NY 12210) No.1- 1979- Volume(issue)/page/year: 7,56,1987 *** OCCUPATIONAL EXPOSURE LIMITS *** OEL-FRANCE;Carcinogen JAN 1993 OEL-GERMANY;Carcinogen JAN 1993 OEL-SWITZERLAND;Carcinogen JAN 1993

This table covers safety warnings, protective measures, incompatible substances and disposal guidelines for this compound.

Symbol	GHS07, GHS08
Signal Word	Warning
Hazard Statements	H302-H351
Precautionary Statements	P281
Personal Protective Equipment	Eyeshields;Faceshields;full-face respirator (US);Gloves;multi-purpose combination respirator cartridge (US);type ABEK (EN14387) respirator filter
Hazard Codes	Xn: Harmful;
Risk Phrases	40
RIDADR	2810
WGK Germany	3
RTECS	UY1575000
Packaging Group	III
Hazard Class	6.1(b)
HS Code	2933990090

This table presents publicly reported synthetic routes, reaction conditions, reactants and product information of the compound.

This table lists upstream starting materials and downstream derivative products related to this chemical.

Precursor 10
CAS#:123-75-1 Pyrrolidine CAS#:110-60-1 putrescine CAS#:120-94-5 1-Methylpyrrolidine CAS#:73722-93-7 1-(methoxymethy...
CAS#:563-70-2 Bromonitromethane CAS#:694-00-8 N-deuteriopyrro... CAS#:25924-78-1 Piperiline CAS#:80-11-5 Diazald
CAS#:543-67-9 Nitrous acid, p... CAS#:544-16-1 Butyl nitrite
DownStream 7
CAS#:5371-52-8 2-Hydroxytetrah... CAS#:123-75-1 Pyrrolidine CAS#:16596-41-1 1-Pyrrolidinamine CAS#:3760-55-2 1-nitropyrrolidine
CAS#:66162-29-6 2-(4-Chlorobenz... CAS#:66162-38-7 2-[(4-methoxyph... CAS#:5455-25-4 N-benzoyl-N-pyr...

This table shows customs‑related data including HS‑code, tariff and regulatory conditions for import and export.

HS Code	2933990090
Summary	2933990090. heterocyclic compounds with nitrogen hetero-atom(s) only. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

This table lists relevant public references with title, journal and publication metadata for this compound.

Commercial formaldehyde standard for mass calibration in mass spectrometry.

J. Mass Spectrom. 50(3) , 463-9, (2015)

Common calibration standards for mass spectrometry can be a source of many problems including instrument contamination, ionization suppression and formation of unidentified ions during subsequent anal...

Toxicological assessment of kretek cigarettes: Part 1: background, assessment approach, and summary of findings.

Regul Toxicol Pharmacol 70 Suppl 1 , S2-14, (2014)

This publication introduces a series of six other publications describing the toxicological assessment of kretek cigarettes, i.e., cigarettes characterized primarily by the use of a significant amount...

Removal of N-nitrosamines in a membrane bioreactor and nanofiltration hybrid system for municipal wastewater reclamation: Process efficiency and mechanisms.

Bioresour. Technol. 190 , 499-507, (2015)

This study investigated the removal efficiency and mechanisms of water contaminants (mainly N-nitrosamines) during municipal wastewater reclamation by a membrane bioreactor (MBR) and nanofiltration (N...

This table collects all English aliases, systematic names and CAS‑related synonyms of the compound.

1-Nitrosopyrrolidine

EINECS 213-218-8

N-nitrosopyrrolidine

MFCD00003166

NPYR

This section contains frequently‑asked‑questions about this compound, including basic parameters, properties, storage conditions and corresponding answers.

Q: What is the boiling point of 1-Nitrosopyrrolidine?

A: Boiling point of 1-Nitrosopyrrolidine is 214.0±9.0 °C at 760 mmHg.

Q: What are the downstream products of 1-Nitrosopyrrolidine?

A: Related downstream products(CAS) of 1-Nitrosopyrrolidine: 5371-52-8;123-75-1;16596-41-1;3760-55-2;66162-29-6;66162-38-7;5455-25-4.

Q: What is the CAS number of 1-Nitrosopyrrolidine?

A: CAS number of 1-Nitrosopyrrolidine is 930-55-2.

Q: What is the LogP of 1-Nitrosopyrrolidine?

A: LogP of 1-Nitrosopyrrolidine is -0.15.

Q: What is the molecular weight of 1-Nitrosopyrrolidine?

A: Molecular weight of 1-Nitrosopyrrolidine is 100.119.

Q: What is the SMILES notation of 1-Nitrosopyrrolidine?

A: SMILES notation of 1-Nitrosopyrrolidine is O=NN1CCCC1.

Q: What is the English name of 1-Nitrosopyrrolidine?

A: The English name of 1-Nitrosopyrrolidine is 1-Nitrosopyrrolidine.

Q: What are the upstream materials of 1-Nitrosopyrrolidine?

A: Related upstream materials(CAS) of 1-Nitrosopyrrolidine: 123-75-1;110-60-1;120-94-5;73722-93-7;563-70-2;694-00-8;25924-78-1;80-11-5;543-67-9;544-16-1.

Q: What is the molecular formula of 1-Nitrosopyrrolidine?

A: Molecular formula of 1-Nitrosopyrrolidine is C4H8N2O.

Q: What English synonyms does 1-Nitrosopyrrolidine have?

A: English synonyms of 1-Nitrosopyrrolidine: 1-Nitrosopyrrolidine, EINECS 213-218-8, N-nitrosopyrrolidine, MFCD00003166, NPYR.

This table lists manufacturers and suppliers of this compound, including vendor names and product supply reference information.

Shanghai Nianxing Industrial Co., Ltd

Dayang Chem (Hangzhou) Co., Ltd.

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Shanghai Nianxing Industrial Co., Ltd
China
Product Name: NPYR
Price: Check
Purity: 98.0%
Delivery: 10 Day
Contact: Yang
Email: sales@echemcloud.com

Dayang Chem (Hangzhou) Co., Ltd.
China
Product Name: Pyrrolidine, 1-nitroso-
Price: $Inquiry/100g $Inquiry/1kg $Inquiry/100kg $Inquiry/1000kg
Purity: 98.0%
Delivery: Inquiry
Contact: Ms Wang
Email: enquiry@dycnchem.com

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