You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(1S,2S,3R,4S,7R,9S,11R,13R,16S)-4-acetyloxy-1-hydroxy-13,15,18,18-tetramethyl-16-[(2R,3R)-2-methyl-3-[(2-methylpropan-2-yl)oxycarbonylamino]-3-phenylpropanoyl]oxy-12-oxo-6-oxapentacyclo[12.3.1.03,11.04,7.09,11]octadec-14-en-2-yl] benzoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C45H55NO11
assistant