2,2'-((2-(2,5-Dioxo-2,5-dihydro-1H-pyrrol-1-yl)ethyl)azanediyl)diacetic acid bis-4-methylbenzenesulfonic acid salt 5g

2,2'-((2-(2,5-Dioxo-2,5-dihydro-1H-pyrrol-1-yl)ethyl)azanediyl)diacetic acid bis-4-methylbenzenesulfonic acid salt 5g