Using COC(=O)C(CCC1OCCO1)c1c(-c2ccc(C)cc2)nc2ccc(C)cn12 to produce COC(=O)C(CCC=O)c1c(-c2ccc(C)cc2)nc2ccc(C)cn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.