4-ethyl-2-hydroxy-3-methylcyclopent-2-en-1-one;4-ethyl-2-hydroxy-3-methyl-cyclopent-2-en-1-one;4-ethyl-2-hydroxy-3-methyl-1-cyclopent-2-enone;2-Cyclopenten-1-one, 4-ethyl-2-hydroxy-3-methyl;2-Cyclopenten-1-one, 2-hydroxy-4-ethyl-3-methyl
4-ethyl-2-hydroxy-3-methylcyclopent-2-en-1-one