You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4aR,5aR,12aR)-2-acetyl-10,12a-dihydroxy-4a,5a-dimethyl-4-propan-2-yl-7-[[3-(3-prop-1-en-2-ylphenyl)cyclopenta-1,3-dien-1-yl]methyl]-4,5,6,11a-tetrahydrotetracene-1,3,11,12-tetrone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C40H42O7
assistant