2-Propenoic acid, 3-phenyl- 3-Phenyl-2-propenoic acid 3-Phenylacrylic acid 3-Phenylpropenoic acid 621-82-9 Cinnamic acid NSC9189 Phenylacrylic acid WLN: QV1U1R Zimtsaeure tert-.beta.-Phenylacrylic acid