Using COCCBr, OCc1cccc(-c2ccc3nc(-c4ccc5ccccc5c4)cn3c2)c1 to produce COCCOCc1cccc(-c2ccc3nc(-c4ccc5ccccc5c4)cn3c2)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.