Using OCCBr, COc1cc2c(Oc3cc(C)c(C)nc3-c3cccc(C)n3)ccnc2cc1O to produce COc1cc2c(Oc3cc(C)c(C)nc3-c3cccc(C)n3)ccnc2cc1OCCO, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.