Using Cc1cc2c(c(C)c1NC(=O)CC(C)(C)C)C(O)C(C)(C)O2 to produce Cc1cc2c(c(C)c1NC(=O)CC(C)(C)C)CC(C)(C)O2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.