Using O=P(Br)(Br)Br, COc1ncnc2c1CN(c1ccc(Cl)cn1)CC2 to produce Clc1ccc(N2CCc3ncnc(Br)c3C2)nc1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.