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Hydroxybenzoic acid and its derivatives reported in clover plants and honey (see Figure 5 for general structure).
| Name | OR1 | R3 | R4 | R5 | R6 |
|---|---|---|---|---|---|
| Gallic acid | -H | -H | -OH | -OH | -OH |
| Syringic acid | -H | -H | -O-Me | -OH | -O-Me |
| p-Hydroxybenzoic acid | -H | -H | -H | -OH | -H |
| m-Hydroxybenzoic acid | -H | -H | -OH | -H | -H |
Legend: -H = hydride, -OH = hydroxide, -OMe = Methoxide.
