Butanoic acid,4-[[2-[[(1S,2R)-2-hydroxy-3-[[(3-methoxyphenyl)methyl]amino]-1-(phenylmethyl)propyl]amino]-2-oxo-1-[[(1-propylbutyl)sulfonyl]methyl]ethyl]amino]-4-oxo-, methyl ester, monohydrochloride