(1R)-1-{3H-[1,2,3]triazolo[4,5-b]pyridin-6-yl}ethan-1-amine

2'-amino-1-benzyl-6'-(hydroxymethyl)-2,8'-dioxo-1,2-dihydro-8'H-spiro[indole-3,4'-pyrano[3,2-b]pyran]-3'-carbonitrile

methyl 1-allyl-2'-amino-6'-(hydroxymethyl)-2,8'-dioxo-8'H-spiro[indoline-3,4'-pyrano[3,2-b]pyran]-3'-carboxylate

methyl 2'-amino-1-(carbamoylmethyl)-6'-(hydroxymethyl)-2,8'-dioxo-1,2-dihydro-8'H-spiro[indole-3,4'-pyrano[3,2-b]pyran]-3'-carboxylate

ethyl 2'-amino-1-(2-amino-2-oxoethyl)-6'-(hydroxymethyl)-2,8'-dioxo-8'H-spiro[indoline-3,4'-pyrano[3,2-b]pyran]-3'-carboxylate

2-[2'-amino-3'-cyano-6'-(hydroxymethyl)-2,8'-dioxo-1,2-dihydro-8'H-spiro[indole-3,4'-pyrano[3,2-b]pyran]-1-yl]acetamide

2-((3-Morpholinopropyl)amino)-4-oxo-4-(phenylamino)butanoic acid

2-((2-((2-Methoxyphenyl)amino)ethyl)amino)-4-oxo-4-(phenylamino)butanoic acid

2-((3-Morpholinopropyl)amino)-4-oxo-4-(p-tolylamino)butanoic acid

4-Oxo-2-(piperazin-1-yl)-4-(p-tolylamino)butanoic acid

2-({2-[(2-Methoxyphenyl)amino]ethyl}amino)-3-[(4-methylphenyl)carbamoyl]propanoic acid