1-Methyl-2-oxaspiro(4.4)nonan-3-one mixed with 3-methyl-2-oxaspiro(4.4)nonan-1-one (3:2) 2-Oxaspiro(4.4)nonan-3-one, 1-methyl-, mixed with 3-methyl-2-oxaspiro(4.4)nonan-1-one (3:2) RP3679300