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organic compounds
The title compound, C27H25NO4, is the major product of the Wittig reaction of (S)-N-triphenylmethylaspartic anhydride with the stabilized ylide Ph3P=C(Me)CO2Me. The crystal structure determination unambiguously confirms the E configuration of the C4=C5 double bond and shows that the molecule, with the exception of the triphenylmethylamino moiety, adopts an overall planar conformation.