You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-2-amino-3-[[1-(4-methylpiperazin-1-yl)-1-oxopropan-2-yl]amino]but-2-enenitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C12H21N5O
assistant