Sulfonamide derivative having isoxazole ring

摘要

A compound represented by the general formula (I-A): wherein R1 is hydroxy and the like; R2 is optionally substituted lower alkyl and the like; R3 is hydrogen atom and the like; R4 is optionally substituted arylene and the like; R5 is a group represented by the formula: R6 is optionally substituted aryl and the like, its optically active substance, their pharmaceutically acceptable salt, or a solvate thereof; and a metalloproteinase inhibitor containing them.