STUDIES ON THIASTEROIDS .2. INVESTIGATIONS CONCERNING THE TOTAL SYNTHESES OF 12 THIASTEROIDS, 2,6-BISTHIABENZ[3,4]ESTRA-3,5(10),8,14-TETRAEN-17-ONE AND ITS D-HOMO ANALOG AND 2,6,16-TRISTHIABENZ[3,4]-D-HOMOESTRA-3,5(10),8,14-TETRAEN-17A-ONE