(2’S,4aR,4bS,6aS,7aS,8aS,8bS,8cR,8dR,9aR,9bR)-4a,6a-dimethylicosahydro-3’H-spiro[cyclopropa[4,5]cyclopenta[1,2-a]cyclopropa[l]phenanthrene-7,2′-furan]-2,5′,9b-triol