1-acetyl-N-[2-(1,3-benzodioxol-5-yl)ethyl]-N-[(2S,3S)-3-[[2-(3-chlorophenoxy)acetyl]amino]-2-hydroxy-4-phenylbutyl]piperidine-4-carboxamide 1-acetyl-N-[2-(1,3-benzodioxol-5-yl)ethyl]-N-[(2S,3S)-3-[[2-(3-chlorophenoxy)acetyl]amino]-2-hydroxy-4-phenyl-butyl]piperidine-4-carboxamide 1-acetyl-N-[2-(1,3-benzodioxol-5-yl)ethyl]-N-[(2S,3S)-3-[[2-(3-chlorophenoxy)-1-oxoethyl]amino]-2-hydroxy-4-phenylbutyl]-4-piperidinecarboxamide 1-acetyl-N-[2-(1,3-benzodioxol-5-yl)ethyl]-N-[(2S,3S)-3-[[2-(3-chlorophenoxy)acetyl]amino]-2-hydroxy-4-phenyl-butyl]isonipecotamide N-[2-(1,3-benzodioxol-5-yl)ethyl]-N-[(2S,3S)-3-[2-(3-chlorophenoxy)ethanoylamino]-2-hydroxy-4-phenyl-butyl]-1-ethanoyl-piperidine-4-carboxamide