Using C=C(C)C1CCC(CC)(CC(=O)OC)c2[nH]c3c(CC)cccc3c21 to produce C=C(C)C1CCC(CC)(CC(=O)O)c2[nH]c3c(CC)cccc3c21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.