References
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- 3,4,5-trimethoxybenzoic acid (50g) was stirred in 800ml H2SO4 at room temperature for 50 hr. 4-hydroxy-2, 6-dimethoxybenzoic acid (40g, 86%) was obtained, m.p.210—212°C
- Shibuya , Masayuki , Abe , Kenichi Nakahashi , Yoshitaka . 1978 . Chem. Pharm. Bull. , 26 : 2671