Using O=Cc1cccnc1, COCCOCOc1c(C(C)(C)C)nc(C)nc1C(C)(C)C to produce COCCOCOc1c(C(C)(C)C)nc(CC(O)c2cccnc2)nc1C(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.