| abstract |
A compound of formula (I), a salt thereof, or a solvate thereof is useful for treating osteoporosis or related osteopenic diseases wherein: A is an optionally substituted aryl group or heterocyclyl group; Ra is -CO-NRsRt; Rs and Rt independently are hydrogen or optionally substituted alkyl, alkenyl, aryl, arylalkyl, heterocyclyl or heterocyclylalkyl group, or together with the nitrogen to which they are attached form a heterocyclyl group; R1 and R2 independently are hydrogen, hydroxy, amino, alkoxy or optionally substituted aryloxy or benzyloxy, alkylamino, dialkylamino, halo, trifluoromethyl, trifluoromethoxy, nitro, alkyl, carboxy, carbalkoxy, carbamoyl, alkylcarbamoyl or together are methylenedioxy, carbonyldioxy or carbonyldiamino; and R3 is hydrogen, alkanoyl, alkyl, aminoalkyl, hydroxyalkyl, carboxyalkyl, carbalkoxyalkyl, carbamoyl or alkylsulphonyl and arylsulphonyl. |