Reported in EPA TSCA Inventory.

The IUPAC name of Picrolonic acid is 5-methyl-4-nitro-2-(4-nitrophenyl)-4H-pyrazol-3-one. With the CAS registry number 550-74-3, it is also named as 3-Methyl-4-nitro-1-p-nitrophenyl-5-pyrazolone. The product's classification code is Mutation data, and the other registry number is 46972-75-2. Besides, it is beige to ochre-yellow powder, which should be stored in a closed, dark, cool and dry place. In addition, its molecular formula is C₁₀H₈N₄O₅ and molecular weight is 264.19.

The other characteristics of this product can be summarized as: (1)EINECS: 208-986-6; (2)ACD/LogP: 0.49; (3)# of Rule of 5 Violations: 0; (4)ACD/LogD (pH 5.5): -1.9; (5)ACD/LogD (pH 7.4): -2.01; (6)ACD/BCF (pH 5.5): 1; (7)ACD/BCF (pH 7.4): 1; (8)ACD/KOC (pH 5.5): 1; (9)ACD/KOC (pH 7.4): 1; (10)#H bond acceptors: 9; (11)#H bond donors: 0; (12)#Freely Rotating Bonds: 3; (13)Index of Refraction: 1.714; (14)Molar Refractivity: 62.52 cm³; (15)Molar Volume: 159.2 cm³; (16)Surface Tension: 78.3 dyne/cm; (17)Density: 1.65 g/cm³; (18)Flash Point: 285.7 °C; (19)Melting Point: 119 °C; (20)Water Solubility: 9000 mg/L at 17 °C; (21)Enthalpy of Vaporization: 82.85 kJ/mol; (22)Boiling Point: 548.8 °C at 760 mmHg; (23)Vapour Pressure: 4.26E-12 mmHg at 25 °C.

Preparation of Picrolonic acid: this chemical can be prepared by 3-Methyl-1-phenyl-2-pyrazolin-5-one.

Uses of Picrolonic acid: this chemical can be used to test alkaloids, Tryptophan, Phenylalanine. It is also used to test strontium, thorium, magnesium and lead. Similarly, it can be used as analytical reagent.

When you are using this chemical, please be cautious about it as the following: it is irritating to eyes, respiratory system and skin. It is also possible risk of irreversible effects. Moreover, it is harmful if swallowed. In case of contact with eyes, please rinse immediately with plenty of water and seek medical advice. And you should wear suitable protective clothing, gloves and eye/face protection.

People can use the following data to convert to the molecule structure.
(1)SMILES: [O-][N+](=O)c2ccc(N1/N=C(\C(C1=O)[N+]([O-])=O)C)cc2
(2)InChI: InChI=1/C10H8N4O5/c1-6-9(14(18)19)10(15)12(11-6)7-2-4-8(5-3-7)13(16)17/h2-5,9H,1H3
(3)InChIKey: OVFUUSPKWADLNJ-UHFFFAOYAM

The toxicity data is as follows: