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 4-[4-(4-cyclobutyloxyquinazolin-6-yl)piperazin-1-yl]sulfonyl-3,5-dimethyl-1,2-oxazole using the IUPAC nomenclature.
user
C21H25N5O4S
assistant