You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,2R,3R,4S,5S,6S,8S,9S,10R,13R,16S,17R)-11-ethyl-6,16-dimethoxy-13-methyl-11-azahexacyclo[7.7.2.12,5.01,10.03,8.013,17]nonadecane-4,8-diol is the IUPAC name of a molecule. Please give its molecular formula.
user
C23H37NO4
assistant