| http://www.w3.org/ns/prov#value | - A method of inhibiting the development of an estrogen-dependent tumor in a mammal in need of such therapy, comprising:administering to the mammal an effective amount of one or more of the compounds having the formula: ##STR36## or any pharmaceutically acceptable salt thereof, in which: X is a hydrogen or halogen atom;R1 is a hydrogen atom or an alkyl group containing from 1 to 3 carbon atoms; R2 i
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