You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (2S)-1-[(2R)-2-methyl-2,3-dihydroindol-1-yl]-2-[(4-methyl-5-phenyl-1,2,4-triazol-3-yl)sulfanyl]propan-1-one into its molecular formula.
user
C21H22N4OS
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