4,7,10,13,16-Pentaoxa-19-azadocosanoic acid, 22-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)-20-oxo-, 2,5-dioxo-1-pyrrolidinyl ester

4,7,10,13,16-Pentaoxa-19-azadocosanoic acid, 22-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)-20-oxo-, 2,5-dioxo-1-pyrrolidinyl ester