3,4,5-Trimethoxyphenylacetic acid (CAS NO.951-82-6) is also named as benzeneacetic acid, 3,4,5-trimethoxy- ; (3,4,5-Trimethoxy-phenyl)-acetic acid ; 3,4,5-Trimethoxyphenylacetic acid 98% ; acetic acid, 3,4,5-trimethoxyphenyl- ; Benzeneacetic acid, 3,4,5-trimethoxy- (9CI) . 3,4,5-Trimethoxyphenylacetic acid (CAS NO.951-82-6) is white to cream-colored crystalline powder.