EN219 is a synthetic covalent ligand with moderate specificity for the N-terminal cysteine C8 of RNF114, with IC50 of 470 nM. EN219 inhibits RNF114-mediated autoubiquitination and p21 ubiquitination.

Physicochemical Properties

Molecular Formula	C17H13BR2CLN2O
Molecular Weight	456.558921575546
Exact Mass	455.906
CAS #	380351-29-1
Related CAS #	EN219-alkyne
PubChem CID	3413196
Appearance	Off-white to light yellow solid powder
LogP	4.7
Hydrogen Bond Donor Count	0
Hydrogen Bond Acceptor Count	2
Rotatable Bond Count	3
Heavy Atom Count	23
Complexity	458
Defined Atom Stereocenter Count	0
SMILES	C(=O)(N1C(C2=CC=C(Br)C=C2)CC(C2=CC=C(Br)C=C2)=N1)CCl
InChi Key	CXRHMHAKZPJNKS-UHFFFAOYSA-N
InChi Code	InChI=1S/C17H13Br2ClN2O/c18-13-5-1-11(2-6-13)15-9-16(22(21-15)17(23)10-20)12-3-7-14(19)8-4-12/h1-8,16H,9-10H2
Chemical Name	1-[3,5-bis(4-bromophenyl)-3,4-dihydropyrazol-2-yl]-2-chloroethanone
Synonyms	EN219; 380351-29-1; 1-[3,5-bis(4-bromophenyl)-3,4-dihydropyrazol-2-yl]-2-chloroethanone; CHEMBL5274261; 3,5-bis(4-bromophenyl)-1-(chloroacetyl)-4,5-dihydro-1H-pyrazole; 1-[3,5-bis(4-bromophenyl)-4,5-dihydro-1H-pyrazol-1-yl]-2-chloroethanone; 1-(3,5-Bis(4-bromophenyl)-4,5-dihydro-1H-pyrazol-1-yl)-2-chloroethanone;
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 Note: Please store this product in a sealed and protected environment (e.g. under nitrogen), avoid exposure to moisture and light.
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

Targets	RNF114 (IC50 = 470 nM)
ln Vitro	Isotopic tandem orthogonal proteolysis ABPP (isoTOP-ABPP) analysis[1] shows that EN219 (1 μM; 90 min) interacts with RNF114 C8, TUBB1 C201, HSPD1 C442, and HIST1H3A C97.
References	[1]. Chemoproteomics-enabled discovery of covalent RNF114-based degraders that mimic natural product function. Cell Chem Biol. 2021 Apr 15;28(4):559-566.e15.
Additional Infomation	The translation of functionally active natural products into fully synthetic small-molecule mimetics has remained an important process in medicinal chemistry. We recently discovered that the terpene natural product nimbolide can be utilized as a covalent recruiter of the E3 ubiquitin ligase RNF114 for use in targeted protein degradation-a powerful therapeutic modality within modern-day drug discovery. Using activity-based protein profiling-enabled covalent ligand-screening approaches, here we report the discovery of fully synthetic RNF114-based recruiter molecules that can also be exploited for PROTAC applications, and demonstrate their utility in degrading therapeutically relevant targets, such as BRD4 and BCR-ABL, in cells. The identification of simple and easily manipulated drug-like scaffolds that can mimic the function of a complex natural product is beneficial in further expanding the toolbox of E3 ligase recruiters, an area of great importance in drug discovery and chemical biology.[1]

Solubility Data

Solubility (In Vitro)

DMSO: 65 mg/mL (142.37 mM)

Solubility (In Vivo)

Note: Listed below are some common formulations that may be used to formulate products with low water solubility (e.g. < 1 mg/mL), you may test these formulations using a minute amount of products to avoid loss of samples. Injection Formulations (e.g. IP/IV/IM/SC) Injection Formulation 1: DMSO : Tween 80： Saline = 10 : 5 : 85 (i.e. 100 μL DMSO stock solution → 50 μL Tween 80 → 850 μL Saline) *Preparation of saline: Dissolve 0.9 g of sodium chloride in 100 mL ddH ₂ O to obtain a clear solution. Injection Formulation 2: DMSO : PEG300 ：Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL DMSO → 400 μLPEG300 → 50 μL Tween 80 → 450 μL Saline) Injection Formulation 3: DMSO : Corn oil = 10 : 90 (i.e. 100 μL DMSO → 900 μL Corn oil) Example: Take the Injection Formulation 3 (DMSO : Corn oil = 10 : 90) as an example, if 1 mL of 2.5 mg/mL working solution is to be prepared, you can take 100 μL 25 mg/mL DMSO stock solution and add to 900 μL corn oil, mix well to obtain a clear or suspension solution (2.5 mg/mL, ready for use in animals). Injection Formulation 4: DMSO : 20% SBE-β-CD in saline = 10 : 90 [i.e. 100 μL DMSO → 900 μL (20% SBE-β-CD in saline)] *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. Injection Formulation 5: 2-Hydroxypropyl-β-cyclodextrin : Saline = 50 : 50 (i.e. 500 μL 2-Hydroxypropyl-β-cyclodextrin → 500 μL Saline) Injection Formulation 6: DMSO : PEG300 : castor oil : Saline = 5 : 10 : 20 : 65 (i.e. 50 μL DMSO → 100 μLPEG300 → 200 μL castor oil → 650 μL Saline) Injection Formulation 7: Ethanol : Cremophor : Saline = 10： 10 : 80 (i.e. 100 μL Ethanol → 100 μL Cremophor → 800 μL Saline) Injection Formulation 8: Dissolve in Cremophor/Ethanol (50 : 50), then diluted by Saline Injection Formulation 9: EtOH : Corn oil = 10 : 90 (i.e. 100 μL EtOH → 900 μL Corn oil) Injection Formulation 10: EtOH : PEG300：Tween 80 : Saline = 10 : 40 : 5 : 45 (i.e. 100 μL EtOH → 400 μLPEG300 → 50 μL Tween 80 → 450 μL Saline) Oral Formulations Oral Formulation 1: Suspend in 0.5% CMC Na (carboxymethylcellulose sodium) Oral Formulation 2: Suspend in 0.5% Carboxymethyl cellulose Example: Take the Oral Formulation 1 (Suspend in 0.5% CMC Na) as an example, if 100 mL of 2.5 mg/mL working solution is to be prepared, you can first prepare 0.5% CMC Na solution by measuring 0.5 g CMC Na and dissolve it in 100 mL ddH2O to obtain a clear solution; then add 250 mg of the product to 100 mL 0.5% CMC Na solution, to make the suspension solution (2.5 mg/mL, ready for use in animals). Oral Formulation 3: Dissolved in PEG400 Oral Formulation 4: Suspend in 0.2% Carboxymethyl cellulose Oral Formulation 5: Dissolve in 0.25% Tween 80 and 0.5% Carboxymethyl cellulose Oral Formulation 6: Mixing with food powders Note: Please be aware that the above formulations are for reference only. InvivoChem strongly recommends customers to read literature methods/protocols carefully before determining which formulation you should use for in vivo studies, as different compounds have different solubility properties and have to be formulated differently.  (Please use freshly prepared in vivo formulations for optimal results.)

Preparing Stock Solutions		1 mg	5 mg	10 mg
	1 mM	2.1903 mL	10.9515 mL	21.9029 mL
	5 mM	0.4381 mL	2.1903 mL	4.3806 mL
	10 mM	0.2190 mL	1.0951 mL	2.1903 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.