Butanoic acid, 2-(((3, 5-bis(acetylethylamino)-2, 4, 6-triiodobenzoyl)amino)methyl)-

Butanoic acid, 2-(((3, 8-dimethyl-5-(1-methylethyl)-1-azulenyl)amino)carbonyl)-

Butanoic acid, 2-(((3-((diethylamino)carbonyl)-5-(ethyl(1-oxopropyl)amino)-2, 4, 6-triiodobenzoyl)amino)methyl)-

Butanoic acid, 2-(((3-((ethylamino)carbonyl)-5-(ethyl(1-oxopropyl)amino)-2, 4, 6-triiodobenzoyl)amino)methyl)-

Butanoic acid, 2-(((3-(4, 7-dihydro-7-oxo-1H-1, 2, 3-triazolo(4, 5-d)pyrimidin-5-yl)-4-propoxyphenyl)amino)methylene)-3-oxo-, ethyl ester, (Z, E), compd. with 2, 2', 2''-nitrilotris(ethanol)

Butanoic acid, 2-(((4-(((carboxymethyl)amino)carbonyl)-2, 3, 5, 6-tetraiodobenzoyl)amino)methyl)-

Butanoic acid, 2-(((4-(((carboxymethyl)methylamino)carbonyl)-2, 3, 5, 6-tetraiodobenzoyl)amino)methyl)-

Butanoic acid, 2-(((5-((4, 6-dideoxy-4-(methylamino)-3-O-beta-D-xylopyranosyl-beta-D-galactopyranosyl)oxy)-5, 6, 8, 13-tetrahydro-1, 6, 9, 14-tetrahydroxy-11-methoxy-3-methyl-8, 13-dioxobenzo(a)naphthacen-2-yl)carbonyl)amino)-, (5S-(2(S*), 5alpha, 6beta))-

Butanoic acid, 2-(((5-ethyl-5, 8-dihydro-8-oxo-1, 3-dioxolo(4, 5-g)quinolin-7-yl)carbonyl)amino)-

Butanoic acid, 2-(((aminocarbonyl)amino)carbonyl)-2-ethyl-

Butanoic acid, 2-(((aminocarbonyl)amino)carbonyl)-2-ethyl-, 2-(dimethylamino)ethyl ester, monohydrochloride

Butanoic acid, 2-(((aminothioxomethyl)amino)carbonyl)-2-ethyl-, methyl ester

Butanoic acid, 2-(((butylthio)methylphosphinyl)oxy)ethyl ester

Butanoic acid, 2-(((tetrahydro-1, 3-dimethyl-2, 6-dioxo-5-nitroso-4(1H)-pyrimidinylidene)hydrazono)methyl)-3-oxo-, ethyl ester

Butanoic acid, 2-((1, 2-dioxopropyl)amino)-1, 4, 10, 19-tetramethyl-17, 18-dioxo-16-oxabicyclo(13.2.2)nonadeca-3, 5, 9, 11-tetraene-7, 13-diyl ester, (1S-(1R*, 2S*, 3E, 5E, 7R*, 9E, 11E, 13R*, 15S*, 19S*))-

Butanoic acid, 2-((1, 2-dioxopropyl)amino)-13-hydroxy-1, 4, 10, 19-tetramethyl-17, 18-dioxo-16-oxabicyclo(13.2.2)nonadeca-3, 5, 9, 11-tetraen-7-yl ester, (1S- (1S-(1R*, 2S*, 3E, 5E, 7R*, 9E, 11E, 13R*, 15S*, 19S*))-

Butanoic acid, 2-((2-nitrophenyl)methylene)-3-oxo-, methyl ester

Butanoic acid, 2-((3, 4-dihydro-2H-pyrrol-5-yl)amino)-3-mercapto-3-methyl-

Butanoic acid, 2-((3, 5-bis(1, 1-dimethylethyl)-4-hydroxyphenyl)methylene)-

Butanoic acid, 2-((3, 5-bis(1, 1-dimethylethyl)-4-hydroxyphenyl)methylene)-3-oxo-, ethyl ester