You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[3-(3-chloro-2-methylphenyl)-4-oxoquinazolin-2-yl]sulfanyl-N-(3-methyl-1,2-oxazol-5-yl)propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H19ClN4O3S
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