Using COCCS(=O)(=O)N1CCN(c2ccc(N3CCN(C(=O)OC(C)(C)C)c4ccccc43)cc2)CC1 to produce COCCS(=O)(=O)N1CCN(c2ccc(N3CCNc4ccccc43)cc2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.