Using CCOC(=O)C(C=O)(CCCCB1OC(C)(C)C(C)(C)O1)NC(=O)OC(C)(C)C, CCCN to produce CCCNCC(CCCCB1OC(C)(C)C(C)(C)O1)(NC(=O)OC(C)(C)C)C(=O)OCC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.