Synonyms: 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*,1ba,6bb,7ab,8aR*,9a,10b,11a,11ab)]-; Tripchlorolide; Triptochlorolide; Triptolide 12,13-chlorohydrin