1,4-DICHLORO-2-BUTYNE 1,4-Dichlorobut-2-yne 1,4-Dichlorobutyne 2-Butyne, 1,4-dichloro- 4-01-00-00973 (Beilstein Handbook Reference) 821-10-3 AI3-26930 BRN 0635740 EINECS 212-474-8 NSC 30603