1 3IN N-[2(S)-cyclopentyl-1(R)-hydroxy-3(R)methyl]-5-[(2(S)-tertiary-butylamino-carbonyl)-4-(n1-(2)-(N-methylpiperazinyl)-3-chloro-pyrazinyl-5-carbonyl)-piperazino]-4(S)-hydroxy-2(R)-phenylmethyl-pentanamide 1.000 2 MK1 N-[2(R)-hydroxy-1(S)-indanyl]-5-[(2(S)-tertiary butylaminocarbonyl)-4(3-pyridylmethyl)piperazino]-4(S)-hydroxy-2(R)-phenylmethylpentanamide 0.714 3 XN1 N-[2-hydroxy-1-indanyl]-5-[(2-tertiarybutylaminocarbonyl)-4(3-pyridylmethyl)piperazino]-4-hydroxy-2-(1-phenylethyl)-pen tanamide 0.702