You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-4-(1,3-benzodioxol-5-ylamino)-2-(4-methylpiperazine-1,4-diium-1-yl)-4-oxobutanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H22N3O5+
assistant