| 摘要 |
Compound represented by formula (1) or a pharmaceutically acceptable solvate thereof, usefull for treating or preventing Paget's disease of bone, hypercalcmia, 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 8 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.
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