You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 5-[[2-[(5-bromothiophen-2-yl)methyl-methylamino]acetyl]amino]-1-methylpyrazole-4-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H19BrN4O3S
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