Using COCCBr, CCn1c(=O)ccc2cnc(Nc3ccc(O)cc3)nc21 to produce CCn1c(=O)ccc2cnc(Nc3ccc(OCCOC)cc3)nc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.