You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 3-ethyl-1-[[3-(4-propan-2-yloxyphenyl)-1,2,4-oxadiazol-5-yl]methyl]-4aH-quinazolin-1-ium-2,4-dione .
user
C22H23N4O4+
assistant