The present invention relates to a compound of the formula: ##STR1## wherein R.sub.1 and Q are independently an optionally esterified or amidated carboxyl group; R.sub.2 is hydrogen, an acyl group or an optionally substituted hydrocarbon residue; X is a divalent hydrocarbon residue which may be substituted; or a salt thereof, which is useful as prophylactic and therapeutic agents of bone diseases and as agents for inhibiting thiol protease.
                            本发明涉及一种化合物,其
化学式为:##STR1## 其中R.sub.1和Q分别是可选择酯化或酰胺化的羧基;R.sub.2是氢、酰基或可选择取代的碳氢残基;X是可能被取代的二价碳氢残基;或其盐,可用作预防和治疗骨疾病的药剂以及抑制
硫醇
蛋白酶的药剂。