1H-cyclopenta[a]pentalene-1,5(2H)-dione, 3,3b,4,6,6a,7-hexahydro-3-hydroxy-2,2,3b,4-tetramethyl-, (3R,3bS,4R)- 3-Hydroxy-2,2,3b,4-tetramethyl-3,3b,4,6,6a,7-hexahydro-2H-cyclopenta[a]pentalene-1,5-dione Hirsutenol A InChI=1/C15H20O3/c1-7-10(16)6-8-5-9-11(15(7,8)4)13(18)14(2,3)12(9)17/h7-8,13,18H,5-6H2,1-4H3/t7-,8?,13+,15+/m0/s rel-(3R,3bS,4R)-3-hydroxy-2,2,3b,4-tetramethyl-3,3b,4,6,6a,7-hexahydro-1H-cyclopenta[a]pentalene-1,5(2H)-dione