2-Cyclopenten-1-one, 3-ethyl-2-hydroxy-4-methyl- 3-Ethyl-2-hydroxy-4-methyl-2-cyclopenten-1-one 3-Ethyl-2-hydroxy-4-methylcyclopent-2-en-1-one 3-Ethyl-4-methylcyclotene 42348-12-9 EINECS 255-767-6 FEMA No. 3453