| abstract |
(57) Abstract: A method for treating and preventing osteoporosis is developed. An effective amount of a compound of formula I (In the formula, R 1 and R 2 are each a methyl or ethyl group when R 1 and R 2 are the same, and when R 1 and R 2 are different, one of them is a methyl or ethyl group and the other is The same or different, provided that they are hydrogen or benzyl groups) or a pharmaceutically suitable salt thereof, together with a polyphosphonate that inhibits bone resorption, or in combination with parathyroid hormone, thereby reducing osteoporosis. Treat or prevent. |