2-Butenenitrile, 4-(2,2,3-trimethyl-3-cyclopenten-1-yl)- 4-(2,2,3-Trimethyl-3-cyclopenten-1-yl)-2-butenenitrile 4-(2,2,3-Trimethyl-3-cyclopentenyl)-2-butenenitrile 71042-97-2 EINECS 275-154-7