1,4-DCB 1,4-DICHLORO-2-BUTENE 1,4-Dichloro-2-butylene 1,4-Dichlorobut-2-ene 1,4-Dichlorobutene-2 2-Butene, 1,4-dichloro- 2-Butylene dichloride 764-41-0 BRN 1361446 EINECS 212-121-8 HSDB 6008 NSC 9452 RCRA waste no. U074 RCRA waste number U074