You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[(11-methyl-3-oxo-4-phenyl-8-thia-4,6,11-triazatricyclo[7.4.0.02,7]trideca-1(9),2(7),5-trien-5-yl)sulfanyl]-N-(1,3-thiazol-2-yl)acetamide into its molecular formula.
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C21H19N5O2S3
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