4-[(4S,7S,10S,13S)-13-{[(2R)-2-methyloxiran-2-yl]carbonyl}-10-benzyl-15-methyl-7-(2-methylpropyl)-2,5,8,11-tetraoxo-4-(2-phenylethyl)-3,6,9,12-tetrazahexadec-1-yl]-4-[(4S,7S,10S,13S)-10-benzyl-15-hydroxy-15-methyl-7,13-bis(2-methylpropyl)-1-(1,4-oxazinan-4-yl)-2,5,8,11,14-pentaoxo-4-(2-phenylethyl)-3,6,9,12-tetrazahexadec-16-yl]-1,4-oxazinan-4-ium chloride