Using O=C1CCC(=O)N1Br, COC(=O)c1cccc2nc(-c3cccnc3N)oc12 to produce COC(=O)c1cccc2nc(-c3cc(Br)cnc3N)oc12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.