Using CCOC(=O)CC1OB(O)c2cc(Oc3cnccn3)cc(OCCNC(=O)OC(C)(C)C)c21 to produce NCCOc1cc(Oc2cnccn2)cc2c1C(CC(=O)O)OB2O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.