Alternariol 9-O-methyl ether dimethyl sulfoxide monosolvate

The title compound (systematic name: 3,7-dihy­droxy-9-meth­oxy-1-methyl-6H-benzo[c]chromen-6-one dimethyl sulfoxide monosolvate), C₁₅H₁₂O₅·C₂H₆OS, was isolated from an unidentified endophytic fungus (belonging to class Ascomycetes) of Taxus sp. In the crystal, both the alternariol 9-O-methyl ether (AME) and the dimethyl sulfoxide (DMSO) mol­ecules exhibit crystallographic mirror symmetry. One of the hy­droxy groups makes bifurcated hydrogen bonds, viz. an intra­molecular bond with the carbonyl group and an inter­molecular bond with the carbonyl group in an inversion-related AME mol­ecule. In the crystal, the AME mol­ecules are organized into stacks parallel with the b axis by π–π inter­actions between centrosymmetrically related mol­ecules [the distance between the centroid of the central ring and the centroid of the meth­oxy-substituted benzene ring in the next mol­ecule of the stack is 3.6184 (5) Å]. Pairs of DMSO mol­ecules, linked via centrosymmetric C—H...O contacts, are inserted into the voids created by the AME mol­ecules, making O—H...O and C—H...O contacts with the hosts.