Using COC(=O)CCCBr, Cc1cccc2scc(CC3C(=S)N=C4C=CC=CN43)c12 to produce COC(=O)CCCSc1nc2ccccn2c1Cc1csc2cccc(C)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.