You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as acetyloxymethyl 4-(acetyloxymethoxycarbonylsulfanyl)butanoate;2-aminoethanethiol;(2,5-dioxopyrrolidin-1-yl)oxycarbonyloxymethyl acetate using the IUPAC nomenclature.
user
C21H32N2O15S2
assistant