1H-pyrazole is an endogenously produced metabolite.

Physicochemical Properties

Molecular Formula	C3H4N2
Molecular Weight	68.08
Exact Mass	68.037
CAS #	288-13-1
Related CAS #	105809-46-9
PubChem CID	1048
Appearance	Off-white to light brown solid powder
Density	1.1±0.1 g/cm3
Boiling Point	187.0±9.0 °C at 760 mmHg
Melting Point	67-70 °C(lit.)
Flash Point	87.5±11.7 °C
Vapour Pressure	0.9±0.3 mmHg at 25°C
Index of Refraction	1.528
LogP	0.32
Hydrogen Bond Donor Count	1
Hydrogen Bond Acceptor Count	1
Rotatable Bond Count	0
Heavy Atom Count	5
Complexity	28.1
Defined Atom Stereocenter Count	0
InChi Key	WTKZEGDFNFYCGP-UHFFFAOYSA-N
InChi Code	InChI=1S/C3H4N2/c1-2-4-5-3-1/h1-3H,(H,4,5)
Chemical Name	1H-pyrazole
HS Tariff Code	2934.99.9001
Storage	Powder-20°C 3 years 4°C 2 years In solvent -80°C 6 months -20°C 1 month
Shipping Condition	Room temperature (This product is stable at ambient temperature for a few days during ordinary shipping and time spent in Customs)

Biological Activity

Additional Infomation

1H-pyrazole is the 1H-tautomer of pyrazole. It is a conjugate base of a pyrazolium. It is a conjugate acid of a pyrazol-1-ide. It is a tautomer of a 3H-pyrazole and a 4H-pyrazole. Pyrazole has been reported in Glycyrrhiza glabra with data available. Pyrazole is a heterocyclic organic compound characterized by a ring structure composed of three carbon atoms and two nitrogen atoms in adjacent positions, with the molecular formula C3H4N2.

Solubility Data

Solubility (In Vitro)

DMSO: 100 mg/mL (1468.86 mM)

Solubility (In Vivo)

Solubility in Formulation 1: ≥ 2.5 mg/mL (36.72 mM) (saturation unknown) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 400 μL PEG300 and mix evenly; then add 50 μL Tween-80 to the above solution and mix evenly; then add 450 μL normal saline to adjust the volume to 1 mL. Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH₂ O to obtain a clear solution. Solubility in Formulation 2: ≥ 2.5 mg/mL (36.72 mM) (saturation unknown) in 10% DMSO + 90% (20% SBE-β-CD in Saline) (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 900 μL of 20% SBE-β-CD physiological saline solution and mix evenly. Preparation of 20% SBE-β-CD in Saline (4°C，1 week): Dissolve 2 g SBE-β-CD in 10 mL saline to obtain a clear solution. Solubility in Formulation 3: ≥ 2.5 mg/mL (36.72 mM) (saturation unknown) in 10% DMSO + 90% Corn Oil (add these co-solvents sequentially from left to right, and one by one), clear solution. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 25.0 mg/mL clear DMSO stock solution to 900 μL of corn oil and mix evenly.  (Please use freshly prepared in vivo formulations for optimal results.)

Preparing Stock Solutions		1 mg	5 mg	10 mg
	1 mM	14.6886 mL	73.4430 mL	146.8860 mL
	5 mM	2.9377 mL	14.6886 mL	29.3772 mL
	10 mM	1.4689 mL	7.3443 mL	14.6886 mL

*Note: Please select an appropriate solvent for the preparation of stock solution based on your experiment needs. For most products, DMSO can be used for preparing stock solutions (e.g. 5 mM, 10 mM, or 20 mM concentration); some products with high aqueous solubility may be dissolved in water directly. Solubility information is available at the above Solubility Data section. Once the stock solution is prepared, aliquot it to routine usage volumes and store at -20°C or -80°C. Avoid repeated freeze and thaw cycles.