You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (4R,4aS,7S,7aS,12bS)-3-(cyclopropylmethyl)-4,7,12-trimethyl-2,4,5,6,7,7a-hexahydro-1H-[1]benzofuro[3,2-e]isoquinoline-4a,9-diol into molecular formula.
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C22H31NO3
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