(E)-2-Chloro-3-(dichloromethyl)-4-oxo-butenoic acid (E)-2-Chloro-3-(dichloromethyl)-4-oxobutenoic acid (E)-3-Formyl-2,4,4-trichloro-2-butenoic acid 115340-67-5 2-Butenoic acid, 3-formyl-2,4,4-trichloro-, (E)- 2-Chloro-3-(dichloromethyl)-4-oxobutenoic acid CCRIS 3770