You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2R,6S,7R,10R,11S,13S,17R)-4,4,7,11,17,18,18-heptamethyl-3,5-dioxatetracyclo[12.3.1.02,6.07,12]octadecane-10,13-diol by IUPAC nomenclature, provide its molecular formula.
user
C23H40O4
assistant