You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance N-[3-(1,3-benzothiazol-2-yl)-4,5,6,7-tetrahydro-1-benzothiophen-2-yl]-1-ethylpyrazole-3-carboxamide .
user
C21H20N4OS2
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