157695-36-8 2H,5H-Pyrano(4,3-b)pyran-2-one, 7,8-dihydro-5-hydroxy-4-methoxy-7,8-dimethyl- 7,8-Dihydro-5-hydroxy-4-methoxy-7,8-dimethyl-2H-5H-pyrano(4,3-b)pyran-2-one Isochlamydosporol