2-Cyclopenten-1-one, 5-ethyl-2-hydroxy-3-methyl- 5-Ethyl-2-hydroxy-3-methyl-2-cyclopenten-1-one 5-Ethyl-2-hydroxy-3-methylcyclopent-2-en-1-one 5-Ethyl-3-methylcyclotene 53263-58-4 EINECS 258-451-6 FEMA No. 3454