You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (1R)-1-[(1S,12R,19R)-10-(hydroxymethyl)-8,16-diazapentacyclo[10.6.1.01,9.02,7.016,19]nonadeca-2,4,6-trien-12-yl]ethanol into molecular formula.
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C20H28N2O2
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