Using NCC(=O)O, CCOC(=O)c1ncc2nc(C(C)(C)C)sc2c1O to produce CC(C)(C)c1nc2cnc(C(=O)NCC(=O)O)c(O)c2s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.