You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (1E,3E)-2-[(2R)-2-methyl-2-(methylamino)-3H-pyridin-4-yl]buta-1,3-diene-1,4-diamine into molecular formula.
user
C11H18N4
assistant