secondary metabolite biosynthesis benzoxazinone biosynthesis 2,4-dihydroxy-1,4-benzoxazin-3-one biosynthesis UPa:UPA00872 KEGG:map01100 KEGG:map01110 DIBOA biosynthesis KEGG:map00400 Biosynthesis of 2,4-dihydroxy-1,4-benzoxazin-3-one (DIBOA), a cyclic hydroxamic acid. This secondary metabolites found predominantly in Gramineae such as many maize (Zea mays). MetaCyc:PWY-4161 PMID:9235894 pathway KEGG:map00402