Vieillardiixanthone BThis paper is dedicated to His Majesty King Bhumibol Adulyadej of Thailand (King Rama IX) for his sustainable development of the country.

Vieillardiixanthone BThis paper is dedicated to His Majesty King Bhumibol Adulyadej of Thailand (King Rama IX) for his sustainable development of the country.

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The title compound [systematic name: 1,5-dihydroxy-3,6-dimethoxy-4-(2-methylbut-3-en-2-yl)-9H-xanthen-9-one], C20H20O6, is a xanthone, which was isolated from the roots of Cratoxylum formosum ssp.pruniflorum.The three rings in the molecule are approximately coplanar, with an r.m.

s.deviation of 0.0372 (2) Å for the plane through the 14 non-H atoms.The O atoms serra avatar price of the two hydroxy substituents also lie close to this plane with deviations of 0.

0669 (2) and 0.1122 (2) Å, respectively.The 1,1-dimethyl-2-propenyl substituent is in a (−)-anticlinal conformation.Intramolecular O—H.

O hydrogen bonds generate S(5) and S(6) ring motifs.In the crystal, molecules are linked into infinite chains along [010] by O—H.O hydrogen bonds and weak C—H.O interactions.

π–π bostik universal primer pro interactions with centroid–centroid distances of 3.6172 (10) and 3.6815 (10) Å are also observed.