You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
gadolinium(3+);5-[4-[2-(hydroxymethyl)quinolin-7-yl]piperazin-1-yl]-5-oxo-2-[4,7,10-tris(carboxymethyl)-1,4,7,10-tetrazacyclododec-1-yl]pentanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C33H47GdN7O10+3
assistant