aromatic compound metabolism hormone biosynthesis aromatic compound biosynthesis melatonin biosynthesis GO:0030187 KEGG:map01100 Biosynthesis of melatonin (5-methoxy-N-acetyltryptamine), a naturally occurring hormone found in most animals and some of other living organisms, including algae. KEGG:map00380 pathway UPa:UPA00837 5-methoxy-N-acetyltryptamine