You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4,7-bis(carboxymethyl)-7-(3-hydroxy-1,4-dioctoxybutan-2-yl)-1,4,10-triaza-7-azoniacyclododec-1-yl]acetic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C34H67N4O9+
assistant