You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (1S,2S,3R,4S,7R)-7-methyl-3-(3,4,5-trihydroxy-6-oxoxanthen-9-yl)bicyclo[2.2.1]hept-5-ene-2-carboxylic acid into its molecular formula.
user