Using COc1ccc(OCc2cnc([C@@H]3CCCN3C(=O)OC(C)(C)C)o2)cc1OC to produce COc1ccc(OCc2cnc([C@@H]3CCCN3)o2)cc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.