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 6-O-methyl 7-O-phenacyl (1S,2R,4S,5S,6S,7S)-tricyclo[3.2.2.02,4]non-8-ene-6,7-dicarboxylate .
user
C20H20O5
assistant