You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-(carboxymethyl)-7-(2,6-dioxooxan-3-yl)-10-(formyloxymethyl)-1,4,7,10-tetrazacyclododec-1-yl]acetic acid;2-[7-[2-(2,5-dioxopyrrolidin-1-yl)oxy-2-oxoethyl]-4-ethyl-10-(formyloxymethyl)-1,4,7,10-tetrazacyclododec-1-yl]acetic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C39H63N9O17
assistant