| 1 | P-coumaric acid |
| 2 | P-hydroxyphenylacrylic acid |
| 3 | Beta-[4-hydroxyphenyl]acrylic acid |
| 4 | 3-(4-hydroxyphenyl)prop-2-enoic acid |
| 5 | 4-hydroxycinnamic acid |
| 6 | P-hydroxycinnamic acid |
| 7 | Para-coumaric acid |
| 8 | 3-(4-hydroxyphenyl)-2-propenoic acid |
| 9 | 4'-hydroxycinnamic acid |
| 10 | 3-(4-hydroxyphenyl)acrylic acid |
| 11 | (2e)-3-(4-hydroxyphenyl)prop-2-enoic acid |
| 12 | (2e)-3-(4-hydroxyphenyl)acrylic acid |
| 13 | (e)-p-coumaric acid |
| 14 | (e)-3-(4-hydroxyphenyl)-2-propenoic acid |
| 15 | (e)-p-hydroxycinnamic acid |
| 16 | Trans-4-hydroxycinnamic acid |
| 17 | Trans-p-hydroxycinnamic acid |
| 18 | Trans-p-coumaric acid |
| 19 | Trans-p-coumarinic acid |
| 20 | Naringeninic acid |
| 21 | Trans-p-hydroxycinnamate |