Methyl isoeugenol (isomethyleugenol) is a phenylpropanoid, the methyl ether of isoeugenol, found in certain essential oils. It can occur as both (E)- and (Z)-isomers. Methyl isoeugenol (isomethyleugenol) is a phenylpropanoid, the methyl ether of isoeugenol, found in certain essential oils. It can occur as both (E)- and (Z)-isomers.