| abstract |
A compound having an inhibitory activity against cysteine protease, represented by formula (I): n n n(wherein ring X is a heterocyclic group which may contain 1 to 4 hetero atoms selected from an nitrogen atom(s), a oxygen atom(s) and a sulfur atom(s) which may be oxidized, in addition to said nitrogen atom in the ring; J is a bond or a spacer having from 1 to 8 atoms; R, R 1 , R 2 and R 3 is each independently hydrogen atom or a substituent; n is 0 or an integer of 1 to 10), a salt thereof, a solvate thereof, or an N-oxide thereof, or a prodrug thereof; and an agent for prevention and/or treatment for a cysteine protease-related disease, such as osteoporosis, comprising it as an active ingredient are provided. |