(2S,4S,5S)-5-[((2S)-2-{(3R)-3-benzyl-4-[(4-methylpiperazin-1-yl)carbonyl]-2-oxopiperazin-1-yl}hexanoyl)amino]-N-butyl-6-cyclohexyl-4-hydroxy-2-isopropylhexanamide
(2s,4s,5s)-5-[((2s)-2-{(3r)-3-benzyl-4-[(4-methylpiperazin-1-yl)carbonyl]-2-oxopiperazin-1-yl}hexanoyl)amino]-n-butyl-6-cyclohexyl-4-hydroxy-2-isopropylhexanamide