(8ξ,9ξ,12a,13ξ,14b,17b)-12-Hydroxy-4,4,7,10,14-pentamethyl-17-[(2E)-6-methyl-2,5-heptadien-2-yl]gonan-3-yl 2-O-b-D-glucopyranosyl-b-D-glucopyranoside