(E)-4-(2,4,6-Trimethoxyphenyl)-4-oxo-2-butenoic acid (E)-4-Oxo-4-(2,4,6-trimethoxyphenyl)-2-butenoic acid 2-Butenoic acid, 4-oxo-4-(2,4,6-trimethoxyphenyl)-, (E)- 84386-14-1