Using COS(=O)(=O)OC, Cc1cccc(CC2(CO)CCN(C(=O)OC(C)(C)C)CC2)c1 to produce COCC1(Cc2cccc(C)c2)CCN(C(=O)OC(C)(C)C)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.