Compound represented by formula (1) or a pharmaceutically acceptable solvate thereof, useful for treating or preventing Paget's disease of bone, hypercalcaemia, osteoporosis or asthma. (1) R
1
represents a C
1
-C
6
alkyl group or C
7
-C
15
aralkyl group (the aromatic ring of which can be substituted by a C
1
-C
6
alkyl group, C
1
-C
6
alkoxy group, a hydroxyl group, a halogenatom or a trifluoromethyl group), R
2
represents a C
1
-C
6
alkyl group, and R
3
represents a C
1
-C
6
alkyl or alkoxy group, which can be substituted with a hydroxyl group.
由以下
化学式(1)表示的化合物或其药用可接受的溶剂盐,用于治疗或预防骨的帕吉特病、高
钙血症、骨质疏松症或哮喘。其中,R1代表C1-C6烷基或C7-C15芳基烷基(其芳香环可以被C1-C6烷基、C1-C6甲氧基、一个羟基、一个卤原子或三
氟甲基取代),R2代表C1-C6烷基,R3代表C1-C6烷基或烷氧基,可以被一个羟基取代。