You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 1-[(2R)-1-(2,3-dihydro-1,4-benzodioxin-6-ylamino)-1-oxopropan-2-yl]piperidin-1-ium-4-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H25N2O5+
assistant