You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3-methoxyphenyl)methyl-[2-[[(S)-(4-methoxyphenyl)-phenylmethyl]amino]-2-oxoethyl]-methylazanium is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H29N2O3+
assistant