3-Penten-2-one, 5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-, monomethylderiv. 5-(2,2,3-Trimethylcyclopent-3-en-1-yl)pent-3-en-2-one, monomethyl derivative 68039-03-2 EINECS 268-228-5