Using OCCn1ccnc1, CS(=O)c1nccc(NC(N)=NCC(F)(F)F)n1 to produce NC(=NCC(F)(F)F)Nc1ccnc(OCCn2ccnc2)n1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.