Using C1CCOC1, CCOC(C)OC(=O)C(O)C(NC(=O)OC(C)(C)C)c1ccccc1 to produce CCOC(C)OC1C(=O)OC(OC(C)(C)C)=NC1c1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.