You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named methyl (1R,2S,6S,10R,16S)-2,16-dimethyl-5,5'-dioxospiro[7,19-dioxahexacyclo[9.8.0.01,18.02,8.06,8.012,16]nonadecane-15,2'-oxolane]-10-carboxylate;methyl (5R,11R,18R)-5,18-dimethyl-5',15-dioxospiro[3-oxapentacyclo[8.8.0.02,4.05,9.013,18]octadec-13-ene-6,2'-oxolane]-11-carboxylate by IUPAC nomenclature, provide its molecular formula.
user
C48H60O13
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