You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-(3,5-dichlorophenyl)-3-(1-formamidoethenyl)-4H-thieno[3,2-b]pyrrole-5-carboxylic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H10Cl2N2O3S
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