Crystal structure of (3 S ,4 S ,4a S ,5 R ,6 R ,6a S ,7 R ,11a S ,11b R )-5,6-bis(benzoyloxy)-3,4a-dihydroxy-4,7,11b-trimethyl-1,2,3,4,4a,5,6,6a,7,11,11a,11b-dodecahydrophenanthro[3,2- b ]furan-4-carboxylic acid methanol monosolvate

The title compound, C 34 H 36 O 9 ·CH 3 OH, is a diterpenoid isolated from the roots of Caesalpinia pulcherrima (L.) Swartz. The three trans -fused six-membered rings are in chair, chair and half-chair conformations. The mean plane of this fused-ring system makes dihedral angles of 67.95 (15) and 83.72 (14)° with the two phenyl rings of the benzoyloxy groups. An intramolecular C—H...O hydrogen bond is observed. In the crystal, molecules are linked via O—H...O hydrogen bonds, forming an infinite chain along the b- axis direction.