7-Acetoxycochinchinone IThis paper is dedicated to the late Her Royal Highness Princess Galyani Vadhana Krom Luang Naradhiwas Rajanagarindra for her patronage of Science in Thailand.

7-Acetoxycochinchinone IThis paper is dedicated to the late Her Royal Highness Princess Galyani Vadhana Krom Luang Naradhiwas Rajanagarindra for her patronage of Science in Thailand.

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The title compound {systematic name: 12-[(2E)-3,7-dimethyl-2,6-octadienyl]-5,8-dihydroxy-2,2-dimethyl-2H,6H-pyrano[3,2-b]xanthen-6-one}, C30H32O6, has four fused rings (A/B/C/D) and the xanthone ring system (A/B/C) is essentially planar, with dihedral angles of 1.85 (13) and 2.47 (13)°, respectively, between rings A and B, and Other Holiday between rings B and C.

The chromene ring D is in a sofa form.The geranyl side chain is axially attached to ring C with an (−)-synclinal conformation.The 3-methyl-2-butenyl terminal of the geranyl side Anti-Glare Film chain is disordered with the site-occupancy ratio of 0.

513 (5):0.487 (5).The acetoxy group is attached axially to ring A with an (+)-synclinal conformation.

An intramolecular O—H.O hydrogen bond involving the carbonyl and hydroxyl groups generates an S(6) ring motif.In the crystal, weak C—H.

O and C—H.π interactions, and π–π interactions with centroid–centroid distances of 3.6562 (16) and 3.

6565 (16) Å are observed.