2.3.1.233 metabolism the enzyme catalyses the synthesis of 1,3,6,8-tetrahydroxynaphthalene which is the key intermediate of melanin biosynthesis 729157 2.3.1.233 metabolism the enzyme catalyzes a major step in the biosynthetic pathway of phlorotannins (i.e., the synthesis of phloroglucinol monomers from malonyl-CoA) -, 730606 2.3.1.233 metabolism the enzyme is involved in melanin biosynthesis 730397