You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3aR,5R,7aR)-1-[(1-methylpyrazol-4-yl)methyl]-5-(oxan-4-ylmethoxymethyl)-3,3a,5,6,7,7a-hexahydro-2H-pyrano[3,2-b]pyrrole by IUPAC nomenclature, provide its molecular formula.
user
C19H31N3O3
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