Using COc1c(C)c2c(c(N)c1C/C=C(\C)CCC(=O)O)C(=O)OC2, CO to produce COC(=O)CC/C(C)=C/Cc1c(N)c2c(c(C)c1OC)COC2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.