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The conformations of stereoisomers of α-arylcinnamic acids and their esters are discussed based on crystal structures of the E and Z forms of 2,3-bis(3,4-dimethoxyphenyl)propenoic acid and its methyl ester. In the E forms of the cinnamic acid and the cinnamic acid ester, the plane of the α-aryl substituent is approximately perpendicular to that of the rest of the molecule. In the Z forms the plane...
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