You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name [4-[(5-methyl-1,2-oxazol-3-yl)methyl]piperazin-4-ium-1-yl]-(4-pyrrolidin-1-ylsulfonylphenyl)methanone into its molecular formula.
user
C20H27N4O4S+
assistant