107-01-7 1735-76-8 2-BUTENE 3-01-00-00732 (Beilstein Handbook Reference) BRN 1718755 Butene, 2- Butene, mixed -1- and -2- isomers Butene-2 Butylene-2 CCRIS 8971 Dimethylethylene EINECS 203-452-9 HSDB 180 Pseudobutylene beta-Butylene