Using COc1cccc(C(=O)Nc2ccc(OCCN)c(-c3ccnn3C)c2)c1, CSCC[C@H](NC(C)=O)C(=O)O to produce COc1cccc(C(=O)Nc2ccc(OCCNC(=O)[C@H](CCSC)NC(C)=O)c(-c3ccnn3C)c2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.