You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(10bR)-2-(3-methoxyphenyl)spiro[1,10b-dihydropyrazolo[1,5-c][1,3]benzoxazine-5,1'-cyclopentane] The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H22N2O2
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