Using CC(C)(C)OC(=O)N1CCC(C(=O)N2CCCNCC2)CC1, O=C1CCC1 to produce CC(C)(C)OC(=O)N1CCC(C(=O)N2CCCN(C3CCC3)CC2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.