Using COc1cc(NCc2ccc3nc(N)nc(N)c3c2C)cc(OC)c1OCC(=O)N[C@@H](CC(C)C)C(=O)OC(C)(C)C to produce COc1cc(NCc2ccc3nc(N)nc(N)c3c2C)cc(OC)c1OCC(=O)N[C@@H](CC(C)C)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.