{2-[(S)-2-(tert-Butyl-dimethyl-silanyloxymethyl)-4-eth-(E)-ylidene-pyrrolidine-1-carbonyl]-4,5-dimethoxy-phenyl}-carbamic acid allyl ester

(2S)(4R)-N-[(2-Allyloxycarbonylamino)-4,5-dimethoxybenzoyl]-2-(tert-butyldimethylsilyloxymethyl)-4-hydroxypyrrolidine