You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[4-(carboxylatomethyl)-7-[2-hydroxy-3-[2-[2-[2-(2-hydroxyethoxy)ethoxy]ethoxy]ethyl-[2-hydroxy-3-[4,7,10-tris(carboxylatomethyl)-1,4,7,10-tetrazacyclododec-1-yl]propyl]amino]propyl]-1,4,7,10-tetrazacyclododec-1-yl]acetate;gadolinium(3+) into its molecular formula.
user
C40H72Gd2N9O16+
assistant