2H-Pyran-2-one, 6-(1,2-dihydroxypentyl)-5,6-dihydro-4-methoxy-, (6S-(6R*(1R*,2S*)))- 41164-59-4 6-(1,2-Dihydroxypentyl)-4-methoxy-5,6-dihydropyran-2-one LL P880 beta LL-P880-beta LL-P880beta