methyl (2R,3R)-2-[(3-carbamimidoylphenyl)methyl]-3-[[4-(1-oxidopyridin-1-ium-4-yl)benzoyl]amino]butanoate
(2R,3R)-2-[(3-carbamimidoylphenyl)methyl]-3-[[[4-(1-oxido-4-pyridin-1-iumyl)phenyl]-oxomethyl]amino]butanoic acid methyl ester
(2R,3R)-2-(3-amidinobenzyl)-3-[[4-(1-oxidopyridin-1-ium-4-yl)benzoyl]amino]butyric acid methyl ester
methyl (2R,3R)-2-[(3-carbamimidoylphenyl)methyl]-3-[[4-(1-oxidopyridin-1-ium-4-yl)phenyl]carbonylamino]butanoate