1,2-Cyclopentanedione, 3,4-dimethyl- 13494-06-9 3,4-Dimethyl-1,2-cyclopentadione 3,4-Dimethyl-1,2-cyclopentanedione 3,4-Dimethylcyclopentane-1,2-dione 825650-60-0 EINECS 236-810-8 FEMA No. 3268