Using COC(=O)C1(NC(=O)c2cc(C(C)(C)C)cc3c2CCC3(C)C)Cc2ccccc2C1 to produce CC(C)(C)c1cc(C(=O)NC2(C(=O)O)Cc3ccccc3C2)c2c(c1)C(C)(C)CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.