Using CCCCc1c(OCCO)c2cccnc2n(-c2ccccc2)c1=O, OCCBr to produce CCCCc1c(OCCOCCO)c2cccnc2n(-c2ccccc2)c1=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.