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 6-butyl-8-[5-(3-hydroxyazetidin-1-yl)sulfonyl-2-propoxyphenyl]-9H-[1,2,4]triazolo[3,4-f]purin-5-one .
user
C22H27N7O5S
assistant