has role independent continuant tertiary alcohol 2-pyranones plant metabolite 4-hydroxy-4-methyloxan-2-one 4-hydroxy-4-methyltetrahydro-2H-pyran-2-one 4-hydroxy-4-methyl-2-oxanone A member of the class of 2-pyranones that is tetrahydro-2<em>H</em>-pyran-2-one substituted by a methyl and hydroxy group at position 4. 4-hydroxy-4-methyltetrahydro-2H-pyran-2-one