You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by 3-O-ethyl 4-O-[(6-methyl-7-oxabicyclo[4.1.0]heptan-3-yl)methyl] 7-oxabicyclo[4.1.0]heptane-3,4-dicarboxylate;3-O-methyl 4-O-[(6-methyl-7-oxabicyclo[4.1.0]heptan-3-yl)methyl] 7-oxabicyclo[4.1.0]heptane-3,4-dicarboxylate;[1-[(6-methyl-7-oxabicyclo[4.1.0]heptan-3-yl)methoxy]-1-oxopropan-2-yl] 6-methyl-7-oxabicyclo[4.1.0]heptane-3-carboxylate ?
user
C54H78O18
assistant