You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (2R)-1-(7-ethyl-1H-indol-3-yl)-2-(1-oxidopyridin-1-ium-2-yl)sulfanyl-2-phenylethanone using the IUPAC nomenclature.
user
C23H20N2O2S
assistant