You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named diethyl (1R,3'R)-3'-(6,7-dimethoxy-3,4-dihydroisoquinolin-1-yl)-6,7-dimethoxyspiro[3,4-dihydro-2H-isoquinoline-1,4'-cyclohexane]-1',1'-dicarboxylate is given. What is its corresponding molecular formula?
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C33H42N2O8
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