Toluene-4-sulfonic acid (1R,2R,3S,4R,4aR,11bS)-2,3-dihydroxy-4-(4-methoxy-benzyloxy)-2,3,4,4a,6,11b-hexahydro-1H-5,8,10-trioxa-cyclopenta[b]phenanthren-1-yl ester