Propanoic acid, 3-[[13-[3-(2,5-dihydro-2,5-dioxo-1H-pyrrol-1-yl)phenyl]-13-oxo-3,6,9-trioxa-12-azatridec-1-yl]oxy]-, 2,5-dioxo-1-pyrrolidinyl ester, 97%, 1g