Using O=C(O)c1cc(-c2ccnc(Nc3cccc(OC(F)(F)C(F)F)c3)n2)ccn1, NCCO to produce O=C(NCCO)c1cc(-c2ccnc(Nc3cccc(OC(F)(F)C(F)F)c3)n2)ccn1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.