You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(1R)-1-[[(2R,3R,11bS)-3-ethyl-9,10-dimethoxy-2,3,4,6,7,11b-hexahydro-1H-benzo[a]quinolizin-2-yl]methyl]-6,7-dimethoxy-3,4-dihydro-1H-isoquinolin-2-yl]-[(2S,3S,4R)-2-ethoxy-3-[2-[2-(2-hydroxyethoxy)ethoxy]ethyl]-4-propan-2-yl-3,4-dihydro-2H-pyran-6-yl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
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C46H68N2O10
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