Using Cc1nc(C(C)(C)C)c(O)c(C(C)(C)C)n1, COCCOCCl to produce COCCOCOc1c(C(C)(C)C)nc(C)nc1C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.