You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule (6R)-4-benzyl-19-(cyclopropylmethyl)-3-ethyl-14-methoxy-8-methyl-7-oxa-4,19-diazapentacyclo[7.7.3.01,8.02,6.011,16]nonadeca-11(16),12,14-triene into molecular formula.
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C31H40N2O2
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