Pentafluoropyridine , its CAS NO. is 700-16-3, the synonyms are 2,3,4,5,6- Pentafluoropyridine ; Pentafluoropyridine ; Perfluoropyridine ; Pentafluoropyridine, 99+% ; Pentafluoropyridine 99% ; 5-Chloro-2-caynopyridine .