4,7,10,13,16,19-Hexaoxaheneicosanoic acid, 21-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)-, 2,5-dioxo-1-pyrrolidinyl ester

4,7,10,13,16,19-Hexaoxaheneicosanoic acid, 21-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)-, 2,5-dioxo-1-pyrrolidinyl ester