Using OCCCBr, O=c1c(Cc2cccnc2)cn2c3cc(Br)ccc3c3cc(O)cc1c32 to produce O=c1c(Cc2cccnc2)cn2c3cc(Br)ccc3c3cc(OCCCO)cc1c32, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.