abstract |
(57) [Problem] To provide a chelating agent for various metals excellent in biodegradability and metal hiding ability. SOLUTION: The compound represented by the following general formula (I). General formula (I) (Wherein R 1 , R 2 , R 3 and R 4 represent a hydrogen atom, an alkyl group, an aryl group, a heterocyclic group, a carboxyl group, an amino group, an alkoxy group, a sulfo group, a nitro group, a phosphono group, an acylamino group , A sulfonylamino group, an aryloxy group, a sulfamoyl group, a carbamoyl group, an alkylthio group, an arylthio group, an acyl group, a hydroxamic acid group or a hydroxy group, and W represents a divalent linking group containing a carbon atom. n and q each represent an integer of 1 to 3. When m, n, and q are 2 or more, m R 1 , n R 3 and q R 4 may be different from each other. M 1 , M 2 , M 3 and M 4 represent a hydrogen atom or a cation. ) |