You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S)-N-benzhydryl-2-[(2R,6S)-2,6-dimethylmorpholin-4-ium-4-yl]propanamide by IUPAC nomenclature, provide its molecular formula.
user
C22H29N2O2+
assistant