2,6-Bis(picrylamino)-3,5-dinitropyridine 2,6-Pyridinediamine, 3,5-dinitro-N,N'-bis(2,4,6-trinitrophenyl)- 3,5-Dinitro-N,N'-bis(2,4,6-trinitrophenyl)-2,6-pyridinediamine 38082-89-2 57158-12-0 BRN 0471067 PYX PYX explosive