1,2-CYCLOPENTANEDIONE, 3-METHYL- 3-Methyl-1,2-cyclopentanedione 3-Methylcyclopentane-1,2-dione 765-70-8 79299-96-0 Cyclotene EINECS 212-154-8 FEMA No. 2700 Methylcyclopentenolone Methylcyclopentenolone (diketo form) Methylcyclopentenolone (natural)