Bisoxireno(4b,5:8a,9)phenanthro(1,2-c)furan-4(2H)-one, 11-chloro-1b,3,6,6b,7,7a,9,10,11,11a-decahydro-9,10-dihydroxy-1b-methyl-10-(1-methylethyl)-, (1bS-(1aR*,1balpha,6bbeta,7abeta,8aR*,9alpha,10beta,11alpha,11abeta))-