Using CCc1c(C(=O)c2cc(C)cc(C)c2)n(C/C=C/COC(C)=O)c(=O)[nH]c1=O to produce CCc1c(C(=O)c2cc(C)cc(C)c2)n(C/C=C/CO)c(=O)[nH]c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.