You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(1R,2S,3S,5R,7R,8S,9R,11R,12S,14R,16S,17R,18S)-16,17,18-triacetyloxy-13-benzoyloxy-7-formyl-7,10-dimethyl-15-methylidene-10-azahexacyclo[7.7.1.12,14.01,12.03,8.03,11]octadecan-5-yl] benzoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C41H43NO11
assistant