Using C1COCCN1, O=C(O)c1ccc(Nc2nc(Br)cn3ccnc23)cc1 to produce O=C(c1ccc(Nc2nc(Br)cn3ccnc23)cc1)N1CCOCC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.