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* Carl Djerassi, Luis Miramontes, George Rosenkranz (1959), "DELTA.4-19-NOR-17.alpha.-ETHINYLANDROSTEN-17.beta.-OL-3 ONE", Canada Patent CA 571510* Miramontes Luis E., Romero Miguel A (1960), "12alpha-hydroxy-12beta-methyltigogenin and 12-methylene steroids derived therefrom", .