You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule diethyl-[2-[(5R)-4-[hydroxy-(4-methoxyphenyl)methylidene]-2,3-dioxo-5-thiophen-2-ylpyrrolidin-1-yl]ethyl]azanium ?
user
C22H27N2O4S+
assistant