Using COc1ccc2nccc(N3CCN(CCNC(=O)OC(C)(C)C)CC3=O)c2n1 to produce COc1ccc2nccc(N3CCN(CCN)CC3=O)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.