[Study on liposoluble constituents of Teucrium labiosum].

Objective: To Study liposoluble constituents of Teurium labiosum.

Methods: The constituents were isolated and purified by silica gel column and Sephadex LH-20 chromatography. Their structures were elucidated by physicochemical properties and spectral analysis.

5,7-Dihydroxy-6,4'-dimeth-oxyflavone.

In the title compound, C(17)H(14)O(6), the benzopyran ring system is essentially planar and forms a dihedral angle of 6.84 (4)° with the other benzene ring. In the crystal structure, centrosymmetrically related mol-ecules are linked into dimers by O-H⋯O hydrogen bonds.