1.14.14.124	dihydromonacolin L acid + [reduced NADPH-hemoprotein reductase] + O2	dihydromonacolin L acid i.e. (3R,5R)-7-[(1S,2S,4aR,6R,8aS)-2,6-dimethyl-1,2,4a,5,6,7,8,8a-octahydronaphthalen1yl]-3,5-dihydroxyheptanoate. The enzyme also catalyses the reaction of EC 1.14.14.124, monacolin L hydroxylase. The enzyme is involved in the biosynthesis of lovastatin