Using O=C(CBr)Nc1nc(-c2ccco2)c(C(=O)C2CCOCC2)s1, CC[O-] to produce CCOCC(=O)Nc1nc(-c2ccco2)c(C(=O)C2CCOCC2)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.