(20S)-2α,3β,12β-Trihydroxy­dammar-24-ene 20-O-β-D-glucopyran­oside (Gynosaponin TN1) as the 2.5-methanol solvate

A crystal structure establishing the relative sterochemistry of the title compound, C₃₆H₆₂O₉·2.5CH₃OH, has been obtained from single-crystal X-ray diffraction data at 150 K. The relative stereochemistry is in accord with previous stereochemistry assignments based on mass spectroscopy and NMR spectroscopy. The asymmetric unit contains two crystallographically independent dammar-24-ene mol­ecules, together with five methanol solvent mol­ecules; one of the solvent mol­ecules is disordered over two sites with occupancies of 0.5. Hydrogen bonds link the two dammar-24-ene mol­ecules and the methanol mol­ecules together into an intricate network, with donor–acceptor distances ranging from 2.646 (8) to 3.227 (3) Å.