leniolisib (CDZ 173)

For research use only.

Catalog No.S8752

leniolisib (CDZ 173) Chemical Structure

CAS No. 1354690-24-6

Leniolisib (CDZ 173) is a potent PI3Kδ selective inhibitor with biochemical IC50 values of 0.244, 0.424, 2.23 and 0.011 μM for PI3Kα, PI3Kβ, PI3Kγ and PI3Kδ, respectively.

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Biological Activity

Description Leniolisib (CDZ 173) is a potent PI3Kδ selective inhibitor with biochemical IC50 values of 0.244, 0.424, 2.23 and 0.011 μM for PI3Kα, PI3Kβ, PI3Kγ and PI3Kδ, respectively.
PI3Kδ [1]
(Cell-free assay)
PI3Kα [1]
(Cell-free assay)
PI3Kβ [1]
(Cell-free assay)
DNA-PK [1]
DNA-PK [1]
(Cell-free assay)
0.011 μM 0.244 μM 0.424 μM 0.88 μM 0.88 μM
In vitro

In vitro, CDZ173 inhibits a large spectrum of immune cell functions, as demonstrated in B and T cells, neutrophils, monocytes, basophils, plasmocytoid dendritic cells, and mast cells. CDZ173 showed no activity up to the highest test concentration when tested against CYP isoform assays (3A3, 2D9, 2D6, 2C9), a panel of ion channels (including hERG) and a protease panel. In a panel of 50 safety related targets (GPCRs, ion channels, transporters), CDZ173 only showed measurable activity for hPDE4D (IC50 = 4.7 μM) and 5HT2B (IC50 = 7.7 μM)[1].

In vivo

In vivo, CDZ173 inhibits B cell activation in rats and monkeys in a concentration- and time-dependent manner. After prophylactic or therapeutic dosing, CDZ173 potently inhibited antigen-specific antibody production and reduced disease symptoms in a rat collagen-induced arthritis model. CDZ173 is absorbed very quickly across species as can be seen by an early Tmax of the oral profiles. Whereas clearance is low to moderate in rats and monkeys, it was found that clearance in dogs is very low resulting in a very high exposure in blood. Plasma protein binding in dogs is very high (>99%) and the distribution of the compound is restricted into tissue (Vss = 0.3 L/kg)[1].


Animal Research:


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  • Animal Models: Adult male Lewis rats (LEW/Han/Hsd)
  • Dosages: 10 mg/kg
  • Administration: p.o.
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 90 mg/mL (199.79 mM)
Water Insoluble
Ethanol '13 mg/mL

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 450.46


CAS No. 1354690-24-6
Storage powder
in solvent
Synonyms N/A
Smiles CCC(=O)N1CCC(C1)NC2=NC=NC3=C2CN(CC3)C4=CC(=C(N=C4)OC)C(F)(F)F

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Clinical Trial Information

NCT Number Recruitment interventions Conditions Sponsor/Collaborators Start Date Phases
NCT02859727 Recruiting Drug: CDZ173 Activated PI3Kdelta Syndrome (APDS); PASLI Disease Novartis Pharmaceuticals|Novartis September 8 2016 Phase 2|Phase 3
NCT02435173 Active not recruiting Drug: CDZ173|Other: Placebo Common Variable Immunodeficiency (CVID) APDS / PASLI Novartis Pharmaceuticals|Novartis August 24 2015 Phase 2|Phase 3

Tech Support

Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

Handling Instructions

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID