It's p-nitrophenol
Chemical name: p-nitrophenol, 4-nitrophenol
CAS#:100-02-7
Molecular formula: C6H5NO3
Molecular weight: 139.12
Appearance light yellow to brown crystal.
Chinese name PNP
English name PNP
PNP
Piperidine
Piperidine, 1,3,3,5,5-pentanitro-
CAS 71706-07-5
Chemical formula C5H6N6O10
Molecular weight 310