| abstract |
This invention relates to prophylactic or therapeutic drug for diabetic nephropathy or glomerulonephritis, comprising, as an active ingredient, a compound or salt thereof represented by general fornula (I) n n n wherein R 1 stands for H or an optionally substituted hydrocarbon residue; R 2 stands for an optionally esterifled carboxyl group; R 3 stands for a group actually or potentially capable of forming an anion; X shows that the phenylene and phenyl groups bind to each other directly or through a spacer having an atomic chain length of two or less; n stands for 1 or 2; ring A stands for a benzene ring having an optional substituent in addition to R 2 ; Y stands for a bond, —O—, —S(O) m — (wherein m stands for 0, 1 or 2), or —N(R 4 )— (wherein R 4 stands for H or an optionally substituted alkyl group). |