Using O=C1N(Cc2ccccn2)c2cccc(Br)c2C1(CO)c1cc2c(cc1O)OCC2 to produce O=C1N(Cc2ccccn2)c2cccc(Br)c2C12COc1cc3c(cc12)CCO3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.