You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,3'R,4aR,7aR)-3-[2-(6-methoxy-2,8-dimethyl-3,4-dihydrochromen-2-yl)ethyl]-4',4',4a,7a-tetramethylspiro[6,7-dihydro-5H-cyclopenta[c]pyran-1,5'-oxolane]-3'-ol is the IUPAC name of a molecule. Please give its molecular formula.
user
C29H42O5
assistant