You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(1,2,3,4,4a,5,7,7a-octahydropyrrolo[3,4-b]pyridin-6-yl)-N-heptan-2-ylacetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H31N3O
assistant