You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-methyl-2-[1-(1-methylpiperidin-3-yl)piperidin-3-yl]-3,3a,4,5,6,6a-hexahydro-1H-cyclopenta[c]pyrrole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H35N3
assistant