1-Cyclopenteneacetonitrile, 1-Cyclopentene-1-acetonitrile, cyclopent-1-enyl-acetonitrile, cyclopent-1-ene-1-acetonitrile, 1-Cyclopentenylacetonitrile, Cyclopent-1-enyl-acetonitril, 1-Cyclopentylacetonitrile, cyclopent-1-eneacetonitrile, 1-(Cyanomethyl)cyclopentene