Apiose 1-reductase uses D-apiitol and NAD+ to produce D-apiose, NADH, and H+. Flavone apiosyltransferase uses UDP-apiose and 5,7,4`-trihydroxyflavone 7-O-beta-D-glucoside to produce UDP, 5,7,4`-trihydroxyflavone (apigenin), and 7-O-[beta-D-apiosyl-(1->2)-beta-D-glucoside. ...