You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3aS,6aS)-1'-acetyl-N,2-dimethylspiro[3,4,5,6a-tetrahydro-1H-cyclopenta[c]pyrrole-6,4'-piperidine]-3a-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H27N3O2
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