2-(3-methyldiazirin-3-yl)ethyl 3-[(1R)-1-phenylethyl]imidazole-4-carboxylate 3-[(1R)-1-phenylethyl]-4-imidazolecarboxylic acid 2-(3-methyl-3-diazirinyl)ethyl ester 3-[(1R)-1-phenylethyl]imidazole-4-carboxylic acid 2-(3-methyldiazirin-3-yl)ethyl ester 2-(3-methyl-1,2-diazirin-3-yl)ethyl 3-[(1R)-1-phenylethyl]imidazole-4-carboxylate