1-Phenyl-2-p-nitrophenyl-3,5-dioxo-4-n-butyl-pyrazolidin [German] 3,5-Pyrazolidinedione, 4-butyl-2-(p-nitrophenyl)-1-phenyl- 4-Butyl-2-(p-nitrophenyl)-1-phenyl-3,5-pyrazolidinedione 746-48-5 G 28234