You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1,1,2,3,3-pentamethyl-4,5-dihydro-2H-indene;1,1,2,3,3-pentamethyl-4,5,6,7-tetrahydro-2H-indene-4-carbaldehyde The above is the IUPAC name of a molecule. Write its molecular formula.
user
C29H46O
assistant