You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 5-[[5-formyl-4-methoxy-2-oxo-6-[(E)-prop-1-enyl]pyran-3-yl]methoxymethyl]-4-methoxy-6-oxo-2-[(E)-prop-1-enyl]pyran-3-carbaldehyde .
user
C22H22O9
assistant