You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1R,13R)-6-prop-1-en-2-yl-7,11,17,19,23-pentaoxahexacyclo[11.10.0.02,10.04,8.014,22.016,20]tricosa-2(10),3,8,14,16(20),21-hexaene The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H18O5
assistant