The object of the present invention is to provide a therapeutic agent for osteoporosis with a good bone mass-increasing effect, but almost no blood calcium-increasing effect.
The present invention provides a therapeutic agent for osteoporosis which comprises, as an active ingredient, a compound of Formula (1):
1
wherein
R
1
and R
2
each represent a hydrogen atom or a methyl group,
R
3
represents a C
1
-C
4
alkyl group which may be substituted with a fluorine atom,
m represents an integer of 0 to 3, and
A represents —CH
2
—CH
2
—, —CH═CH— or —C≡C—.