Using COC(=O)CCCBr, S=C1N=C2C=CC=CN2C1Cc1cccc2ccccc12 to produce COC(=O)CCCSC1N=C2C=CC=CN2C1Cc1cccc2ccccc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.