You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3,9,15-tribenzyl-6-ethyl-4,10,16-trimethyl-12,18-di(propan-2-yl)-1,7,13-trioxa-4,10,16-triazacyclooctadecane-2,5,8,11,14,17-hexone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C44H55N3O9
assistant