Using O=C(O)C1(c2ccc(Nc3nc(N4CCOCC4)nc4c3CCC4)cc2)CCCC1 to produce OCC1(c2ccc(Nc3nc(N4CCOCC4)nc4c3CCC4)cc2)CCCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.