1.1.1.1 alcohol dehydrogenase phenylethanol biosynthesis 1.4.3.4 monoamine oxidase phenylethanol biosynthesis 1.4.3.21 primary-amine oxidase phenylethanol biosynthesis 4.1.1.28 aromatic-L-amino-acid decarboxylase phenylethanol biosynthesis 4.1.1.53 phenylalanine decarboxylase phenylethanol biosynthesis 4.1.1.109 phenylacetaldehyde synthase phenylethanol biosynthesis