organic compounds
The structures of morusin, 2-(2,4-dihydroxyphenyl)-5-hydroxy-8,8-dimethyl-3-(3-methyl-2-butenyl)- 4H,8H-benzo[1,2-b;3,4-b']dipyran-4-one (C25H24O6) (I) and morusin dimethyl ether, 2-(2,4-dimethoxyphenyl)-5-hydroxy-8,8-dimethyl-3-(3-methyl- 2-butenyl)-4H,8H-benzo[1,2-b;3,4-b']dipyran-4-one (C27H28O6) (II) are reported. In molecules (I) and (II), the benzopyranone moiety is planar. The dihedral angles between benzopyranone moiety and phenyl ring are 66.25 (10) and 85.32 (5)°, respectively. When the dihydroxyphenyl [dimethoxyphenyl for (II)] and 3-methyl-2-butenyl groups are fixed in the same positions to the benzopyranone plane, the pyrano rings of (I) and (II) are enantiomeric.