Crystal structure of (3S∗,4S∗,4aS∗,5R∗,6R∗,6aS∗,7R∗,11aS∗,11bR∗)-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

Abstract

The title compound, C34H36O9·CH3OH, 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.