[(5,6,9a-Substituted-3-oxo-1,2,9,9a-tetrahy dro-3H-fluoren-7-yl)
[(5,6,9a-Substituted-3-oxo-1,2,9,9a-tetrahydro-3H-fluoren-7-yl)o
[(5,6-dichloro-3-oxo-2,9a-alkano-2,3,9,9a-tetrahydro-1H-fluoren-
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