You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3-methoxy-2-phenylmethoxy-8,9-dihydro-7H-benzo[7]annulen-6-yl)-[4-(3,4,5-trimethoxybenzoyl)piperazin-1-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C34H38N2O7
assistant