Using OCCO, Cc1ccc(N2C(=O)c3cccc4c(Br)ccc(c34)C2=O)cc1 to produce Cc1ccc(N2C(=O)c3cccc4c(OCCO)ccc(c34)C2=O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.