(R)-3-[(1S,2S,3S)-2-Formyloxymethyl-3-(4-methoxy-phenyl)-cyclopropylcarbamoyl]-5-methyl-hexanoic acid

[1S-(1α,2β,3β)]-(2-(4-methoxyphenyl)-3-triisopropylsilyloxymethyl)cyclopropane-1N-allyloxycarbonylaminocyclopropane