(2R*,3R*,4aS*,6aR*,11aS*,11bS*)-Methyl 2-acetoxy-11b-hydroxy-3,7-dimethyl-1,2,3,4,4a,5,6,6a,7,11,11a,11b-dodecahydrophenanthro[3,2-b]furan-3-carboxylate

In the title compound, C22H30O6, the conformation of the molecule is dictated by an intramolecular C—H⋯O contact. The crystal structure is stabilized via intermolecular C—H⋯O, O—H⋯O and C—H⋯π contacts.

In the title compound, C 22 H 30 O 6 , the conformation of the molecule is dictated by an intramolecular C-HÁ Á ÁO contact. The crystal structure is stabilized via intermolecular C-HÁ Á ÁO, O-HÁ Á ÁO and C-HÁ Á Á contacts.
Because of the 1,3 diaxial interactions, the cyclohexane ring A is distorted from an ideal chair conformation. This is most evident in the twisting of the six-membered ring at C17, which allows the C12-C17-C16 angle to increse to 113.01°.

Experimental
Mature seed kernels of Caesalpinia decapetala were collected from Bhalki, Bidar District, Karnataka. A specimen is deposited in the herbarium Department of Botany, Gulbarga University, Gulbarga, Karnataka, India. with voucher specimen No·HGUG-209. Seeds were finely ground (particle size 2 mm) and extracted with soxhlet extractor with n-hexane for 20 h and maintaining the Temperature at 333 K Oil recovered was weighed (29/100 g ms) and stored in air tight container for further analysis. The oil obtained was taken in glass test tube covered with aluminium foil and kept in refrigerator, after 15 days of storage granular particles were setteed at the bottom of the test tube. These particles were separated and washed with n-hexane and then it was repeatedly washed with petroleum ether and dried at the room temperature, these fine powdered supplementary materials sup-2 particles were re-dissolved in double distilled alcohol and kept for 4-8 days for crystallization. After 24 h formation of pointed colorless crystals were formed at the bottom of the container.

Refinement
All hydrogen atoms were initially located in a difference Fourier map. The methine (CH) and methylene (CH 2 ) H atoms were then placed in geometrically idealized positions and allowed to ride on their parent atoms with C-H distances in the range 0.97-0.98 Å and U iso (H) = 1.2U eq (C). The CH 3 and OH hydrogen atoms were constrained to an ideal geometry with C-H distances as 0.96 Å and U iso (H) = 1.5U eq (C), and O-H distances fixed at 0.82 Å and U iso (H) = 1.5U eq (O).
During refinement, each methyl and hydroxyl group was however allowed to rotate freely about its C-C and C-O bond respectively.