You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (2R)-1-[1-methoxy-3-(trifluoromethyl)-7,8-dihydro-5H-1,6-naphthyridin-1-ium-6-yl]-2-methyl-5-(oxan-4-ylamino)pentan-1-one into its molecular formula.
user
C21H31F3N3O3+
assistant