Using CCCNc1cccc2nc(Nc3c(C)cc(C)cc3C)n(C)c12, O=CC1CC1 to produce CCCN(CC1CC1)c1cccc2nc(Nc3c(C)cc(C)cc3C)n(C)c12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.