1,4-DICHLORO-cis-2-BUTENE 1476-11-5 2-Butene, 1,4-dichloro-, (2Z)- 2-Butene, 1,4-dichloro-, (Z)- 2-Butene, 1,4-dichloro-, cis- CCRIS 2651 EINECS 216-021-5 HSDB 5832 cis-1,4-Dichloro-2-butene cis-2,3-Dichlorobut-2-ene