| http://www.w3.org/ns/prov#value | - A method for treating or preventing osteoporosis comprising administering to a mammal in need of such treatment an enhanced effective amounts of a compound of formula I ##STR4##wherein R.sup.1 and R.sup.2 may be the same or different provided that when R.sup.1 and R.sup.2 are the same, each is a methyl or ethyl group, and, when R.sup.1 and R.sup.2 are different, one of them is a methyl or ethyl gr
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