You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,6S,7S,11S,12S,14R,18R)-6-(furan-3-yl)-1,7,11,15,15-pentamethyl-3-oxapentacyclo[8.8.0.02,4.02,7.011,16]octadecane-12,14,18-triol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H38O5
assistant