You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aR,7aR)-2-(1H-indazole-5-carbonyl)-N-methyl-1,3,3a,4,6,7-hexahydropyrano[3,4-c]pyrrole-7a-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H20N4O3
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