4-nitrophenyl 5-amino-4-carbamoyl-1H-imidazole-1-carboxylate

2-(8-carbamoyl-4-oxoimidazo[5,1-d][1,2,3,5]tetrazin-3-yl)acetic acid

ethyl (8-carbamoyl-3,4-dihydro-4-oxoimidazo<5,1-d>-1,2,3,5-tetrazin-3-yl)acetate

2-(8-carbamoyl-4-oxoimidazo[5,1-d][1,2,3,5]tetrazin-3(4H)-yl)acetic (isobutyl carbonic) anhydride

phenyl (E)-3-(4-cyano-1-(tetrahydro-2H-pyran-2-yl)-1H-imidazol-5-yl)-1-methyltriaz-2-ene-1-carboxylate