Synthesis of new pentacyclic heterocyclic steroidal analogs, 6-oxabenz[3,4]-D-homoestra-1,3,5(10),8,14-pentaen-17a-one and 3a,4,5,13-tetrahydro-3H-[2]benzothieno[5,4-d]naphtho-[1,2-b]pyran

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