Using CCOC(=O)c1ccc2nc(SC)nc(-c3cccc(OC)c3)c2c1N to produce COc1cccc(-c2nc(SC)nc3ccc(C(=O)O)c(N)c23)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.