Using C[C@@H]1CN(c2ccc3c(c2)OCCN(C(=O)OC(C)(C)C)C3)C[C@H](C)O1 to produce C[C@@H]1CN(c2ccc3c(c2)OCCNC3)C[C@H](C)O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.