(4-Hydroxy-3-methoxyphenyl)acetic acid 3-Methoxy-4-hydroxyphenylacetic acid 306-08-1 4-Hydroxy-3-methoxybenzeneacetic acid 4-Hydroxy-3-methoxyphenylacetic acid Acetic acid, (4-hydroxy-3-methoxyphenyl)- Benzeneacetic acid, 4-hydroxy-3-methoxy- HMPA HVA Homovanillic acid NSC16682 Vanillacetic acid