Using CN(C)C=Nc1nc(O)ncc1F, CC(C)(C)C(=O)OCCl to produce CN(C)C=Nc1nc(=O)n(COC(=O)C(C)(C)C)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.