Farnesiaside, a new diterpene glycoside

In the title compound, C26H38O10, the acafarnane skeleton consists of three cis-fused rings, of which the five-membered ring is in an envelope conformation and the two six-membered rings adopt twist-boat and chair conformations. The lactone ring is in an envelope conformation. The D-glucose, in the beta position with respect to the acafarnane skeleton, adopts a chair conformation. The molecular structure and the crystal packing are stabilized by O-(HO)-O-... interactions including a bifurcated hydrogen bond.