(E)-3-(2,3,4-Trimethoxybenzoyl)acrylic acid (E)-4-(2,3,4-Trimethoxyphenyl)-4-oxo-2-butenoic acid (E)-4-(2,3,4-Trimethoxyphenyl)-4-oxo-2-butensaeure [German] 2-Butenoic acid, 4-oxo-4-(2,3,4-trimethoxyphenyl)- 39901-44-5 Acrylic acid, 3-(2,3,4-trimethoxybenzoyl)-, (E)-