Using Cc1csc(Nc2ncc(Br)cc2OCc2ccccc2)n1, [Li]CCCC to produce Cc1cnc(Nc2nc(C)cs2)c(OCc2ccccc2)c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.