4-[(3S,5R,7S,10S,13S,18aR)-13-(3-{[(E)-(acetylamino)(amino)methylidene]amino}propyl)-5-hydroxy-7-(1H-imidazol-5-ylmethyl)-1,8,11,14,19-pentaoxohexadecahydro-1H-3,6-methanopyrrolo[2,1-c][1,4,7,10,13]pentaazacyclohexadecin-10-yl]butanoic acid [ 289665-92-5 ]