You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[3-(2-chlorophenoxy)azetidin-1-yl]-[(5R,7S)-5,7-dimethyl-1,4,5,7-tetrahydropyrano[3,4-c]pyrazol-3-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
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C18H20ClN3O3
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