propionic acid (9R,10R)-9-acetoxy-8,8-dimethyl-9,10-dihydro-2H,8H-benzo(1,2-b-3,4-b')dipyran-2-one-10-yl ester
propionic acid (9r,10r)-9-acetoxy-8,8-dimethyl-9,10-dihydro-2h,8h-benzo(1,2-b-3,4-b')dipyran-2-one-10-yl ester