.beta.-[4-Hydroxyphenyl]acrylic acid 2-Propenoic acid, 3-(4-hydroxyphenyl)- 4'-Hydroxycinnamic acid 4-Coumaric acid 4-Hydroxycinnamic acid 7400-08-0 Cinnamic acid, p-hydroxy- HYDROXYCINNAMIC ACID NSC59260 Para-Coumaric acid p-Coumaric acid p-Cumaric acid p-Hydroxycinnamic acid p-Hydroxyphenylacrylic acid