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 methyl 2-[[4-[(4-chloro-3,5-dimethylpyrazol-1-yl)methyl]-5-methyl-1,2-oxazole-3-carbonyl]amino]-5,6-dihydro-4H-cyclopenta[b]thiophene-3-carboxylate .
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C20H21ClN4O4S
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