You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (1R,3R,3aS,6aS)-5-benzyl-3-ethyl-1-(2-hydroxyphenyl)-4,6-dioxo-1,2,3a,6a-tetrahydropyrrolo[3,4-c]pyrrol-2-ium-3-carboxylate .
user
C22H22N2O5
assistant