You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(2S,5R)-5-methyl-5-(9H-pyrido[3,4-b]indol-1-ylmethyl)oxolan-2-yl]propan-2-yl acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H26N2O3
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