In an attempt to relate structure and antigonadotropin iwtivity, a series of changes were effected on the active triphenylethylene structures. These rhanges include:(I j substitution of a cycloalkyl group for one of i tic, benzene rings;(2) bridging two of the henzene rings to give fluorene, diben~ ocycloheptadieiie, and dibenzorycloheptatriene groups;(3) replacement of the ethylenic link with a cylopropyl group;(4) replacement of one of the aliphatic carbon ...