3-ethenyl-2,5-dimethylcyclopent-2-en-1-one;2,5-dimethyl-3-vinyl-cyclopent-2-en-1-one;2,5-dimethyl-3-vinyl-1-cyclopent-2-enone;3-ethenyl-2,5-dimethyl-cyclopent-2-en-1-one
3-ethenyl-2,5-dimethylcyclopent-2-en-1-one