You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 4-methyl-2-[1-[(2-methyl-2-phenylpropanoyl)amino]ethyl]-1,3-thiazole-5-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C17H20N2O3S
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