. "{(S)-1-[N'-[(2S,3S)-2-Hydroxy-3-((S)-2-methoxycarbonylamino-3-methyl-butyrylamino)-4-phenyl-butyl]-N'-(4-pyridin-2-yl-benzyl)-hydrazinocarbonyl]-2,2-dimethyl-propyl}-carbamic acid methyl ester" . "23b" . . . . . . . .