131589-59-8 3-(4-Azido-2,3,5,6-tetrafluorobenzoyl)-6-hydroxy-2-(4-hydroxyphenyl)benzo(b)thiophene Methanone, (4-azido-2,3,5,6-tetrafluorophenyl)(6-hydroxy-2-(4-hydroxyphenyl)benzo(b)thien-3-yl)- Tetrafluoroaryl azide, tfaa