3221324 PNPH p-nitrophenol hydroxylase 30 3221325 p-NPh p-nitrophenol 7 3221322 PNPH p-nitrophenyl hexanoate 5 3221323 PNPH polynitroxylated pegylated hemoglobin 5 3221321 PNPH pine nut protein hydrolysate 1 3221328 PNPH purine nucleoside phosphorylase 1