You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-(furan-3-yl)-17-hydroxy-1,7,11,15,15-pentamethyl-3-oxapentacyclo[8.8.0.02,4.02,7.011,16]octadeca-12,16-diene-14,18-dione;(2-hydroxy-4-methoxyphenyl)-(2-hydroxyphenyl)methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C40H42O9
assistant