Patent ID: 6897237

Claim:
A compound of the formula (I): wherein R 1 is NHOH, hydroxy, or lower alkyloxy; R 2 is hydrogen atom, optionally substituted lower alkyl, optionally substituted aryl, or optionally substituted aralkyl; R 3 is hydrogen atom, optionally substituted lower alkyl, optionally substituted aryl, or optionally substituted aralkyl; R 4 is optionally substituted arylene; R 5 is a bond, —(CH 2 )p—, —CH═CH—, —C≡C—, —CO—, —CO—NH—, —N═N—, —N(R A )—, —NH—CO—NH—, —NH—CO—NH—, —O—, —S—, —SO 2 —, —SO 2 NH—, or —SO 2 —NH—N═CH—, wherein R A is hydrogen atom or lower alkyl, p is 1 or 2. R 7 is each independently hydrogen atom, halogen, lower alkyl, cycloalkyl, lower alkenyl, lower alkynyl, lower alkyloxy, lower alkenyloxy, lower alkylthio, halo(lower)alkyl, hydroxy, carboxy, lower alkyloxycarbonyl, aminocarbonyl, acyl, nitro, cyano, or optionally substituted amino; m is 0, 1, 2, or 3, its optically active substance, its prodrug, their pharmaceutically acceptable salt, or solvate thereof.