Using COC(=O)CC(=O)OC, Nc1nc(CCl)nc2c1nc(O)n2Cc1ccccc1 to produce COC(=O)C(Cc1nc(N)c2nc(O)n(Cc3ccccc3)c2n1)C(=O)OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.