Using CCOC(=O)C(Cc1cc(CNC(=O)OC(C)(C)C)c2occc2c1)OC(C)C to produce CCOC(=O)C(Cc1cc2c(c(CNC(=O)OC(C)(C)C)c1)OCC2)OC(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.