You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3,3-dimethyl-6-(2-methylpyrimidin-5-yl)-1-(5-methyl-1,3-thiazol-2-yl)-3a,7a-dihydroindol-2-one .
user
C19H20N4OS
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