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-cyclopropyl-N-ethylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H25N3O
assistant