You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R,9R,17R)-12-methoxy-5,18-dimethyl-10-oxa-7,18-diazahexacyclo[9.9.1.01,9.02,17.04,8.015,21]henicosa-4(8),5,11,13,15(21)-pentaen-6-yl]-[4-(methylamino)-4-phenylpiperidin-1-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C34H40N4O3
assistant