CPI-1612 (CPI1612; P300/CBP-IN-6) is a novel, oral and potent p300/CBP histone acetyltransferase (HAT) inhibitor (IC50 = 8.1 nM) with anticancer activity. The histone acetyltransferases, CREB binding protein (CBP) and EP300, are master transcriptional co-regulators that have been implicated in numerous diseases, such as cancer, inflammatory disorders, and neurodegeneration.

Physicochemical Properties

Molecular Formula	C27H26N6O
Molecular Weight	450.534945011139
Exact Mass	450.216
CAS #	2374971-81-8
Related CAS #	(R,R)-CPI-1612;2374972-35-5;(S,S)-CPI-1612;2374971-82-9
PubChem CID	146014965
Appearance	White to off-white solid powder
LogP	3.6
Hydrogen Bond Donor Count	2
Hydrogen Bond Acceptor Count	5
Rotatable Bond Count	8
Heavy Atom Count	34
Complexity	693
Defined Atom Stereocenter Count	2
SMILES	O=C([C@@H](C1C=CC=CC=1)NC[C@@H](C)C1C=CC(C#N)=CC=1)NC1C=CC(=CN=1)C1C=NN(C)C=1
InChi Key	SEDFZSHSBUXKAC-NIYFSFCBSA-N
InChi Code	InChI=1S/C27H26N6O/c1-19(21-10-8-20(14-28)9-11-21)15-30-26(22-6-4-3-5-7-22)27(34)32-25-13-12-23(16-29-25)24-17-31-33(2)18-24/h3-13,16-19,26,30H,15H2,1-2H3,(H,29,32,34)/t19-,26-/m1/s1
Chemical Name	(2R)-2-[[(2S)-2-(4-cyanophenyl)propyl]amino]-N-[5-(1-methylpyrazol-4-yl)pyridin-2-yl]-2-phenylacetamide
Synonyms	P300/CBPIN6 P300/CBP IN 6CPI-1612 CPI1612 CPI 1612
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

Targets	IC50: 330 nM (p300 HAT)
ln Vitro	At IC50 values of less than 0.5 nM and 2.9 nM, respectively, CPI-1612 inhibits both full-length EP300 and full-length CBP [1]. CPI-1612 has IC50 values of 14 nM and <7.9 nM, respectively, which suppress the growth of JEKO-1 cells and H3K18Ac MSD (H3K18=histone 3 lysine 18, MSD=mesoscale discovery)[1]. CYP2C8 (IC50=1.9 μM) and CYP2C19 (IC50=2.7 μM) are moderately inhibited by CPI-1612 (Compound 17), but its action in the hERG binding assay is weak (IC50=10.4 μM) [1].
ln Vivo	CPI-1612 (Compound 17; 0.5 mg/kg; buffered solution; twice daily; for 4 weeks) decreased H3K27Ac in the buffer and H3K18Ac in the tumor, hence preventing tumor development by 67% [1]. Compound 17 (1612) administered intravenously at a dose of 0.5 mg/kg; 1.0 mg/kg border clearance = 0.42 L/h/kg, Vss = 3.7 L/kg, T1/2 = 5.5 h, F% = 71; AUC/Dose = 1691 h·mg/mL) and mice (1 mg/kg i.v.; 5 mg/kg Boundary clearance = 3.8 L/h/kg, Vss = 2.0 L/kg, T1/2 = 0.98 h, F % = 79; AUC/dose = 211 h·mg/mL)[1]. CD-1 mice were given a single dose of CPI-1612, and the durations of their venous and cerebral exposure to the drug were recorded at 0.25, 0.5, 1.0, 2.0, 4.0, and 8.0. CPI-1612 has a single post-lateral wall-to-cerebrovascular ratio of 0.35, indicating that it is extremely brain-penetrating[1].
Animal Protocol	Animal/Disease Models: C57B6 mice injected with JEKO- 1 cell [1] Doses: 0.5 mg/kg Doses: po (po (oral gavage)) twice (two times) daily; for 4 weeks Experimental Results: 67% tumor growth inhibition at 0.5 mg/kg dose (TGI).
References	[1]. Discovery of CPI-1612: A Potent, Selective, and Orally Bioavailable EP300/CBP Histone Acetyltransferase Inhibitor. ACS Med Chem Lett. 2020 Apr 23;11(6):1324-1329.

Solubility Data

Solubility (In Vitro)

DMSO : ~230 mg/mL (~510.51 mM)

Solubility (In Vivo)

Solubility in Formulation 1: 5 mg/mL (11.10 mM) in 10% DMSO + 40% PEG300 + 5% Tween80 + 45% Saline (add these co-solvents sequentially from left to right, and one by one), suspension solution; with sonication. For example, if 1 mL of working solution is to be prepared, you can add 100 μL of 50.0 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: ≥ 5 mg/mL (11.10 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 50.0 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	2.2196 mL	11.0980 mL	22.1961 mL
	5 mM	0.4439 mL	2.2196 mL	4.4392 mL
	10 mM	0.2220 mL	1.1098 mL	2.2196 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.