pirtobrutinib   Click here for help

GtoPdb Ligand ID: 11628

Synonyms: BTK inhibitor 16 | Jaypirca® | LOXO-305 | LOXO305 | MCL-133 | MCL133 | RXC005
Approved drug PDB Ligand Immunopharmacology Ligand
pirtobrutinib is an approved drug (FDA & EMA (2023))
Compound class: Synthetic organic
Comment: Pirtobrutinib (LOXO-305, MCL-133) is a selective and reversible (non-covalent), oral Bruton's tyrosine kinase (BTK) inhibitor that was originally developed by LOXO oncology (now Lilly Oncology) for potential to treat B cell malignancies [3,5]. It binds within the BTK kinase pocket but its interaction does not rely on the C481 residue that is essential for the activity of earlier irreversible BTK inhibitors (ibrutinib, acalabrutinib, and zanubrutinib). Therefore, it is expected to be active in cancers with wild type BTK or with C481 resistance mutations.
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Ligand Activity Visualisation Charts

These are box plot that provide a unique visualisation, summarising all the activity data for a ligand taken from ChEMBL and GtoPdb across multiple targets and species. Click on a plot to see the median, interquartile range, low and high data points. A value of zero indicates that no data are available. A separate chart is created for each target, and where possible the algorithm tries to merge ChEMBL and GtoPdb targets by matching them on name and UniProt accession, for each available species. However, please note that inconsistency in naming of targets may lead to data for the same target being reported across multiple charts.

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View interactive charts of activity data across species
2D Structure
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2D Structure

An image of the ligand's 2D structure. For small molecules with SMILES these are drawn using the NCI/CADD Chemical Identifier Resolver. Click on the image to access the chemical structure search tool with the ligand pre-loaded in the structure editor. For other types of ligands, e.g. longer nucleotides and peptides, a manually drawn representation of the molecule may be provided.

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Physico-chemical Properties
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Physico-chemical Properties

Calculated molecular properties are available for small molecules and natural products (not peptides). Properties were generated using the CDK toolkit. All properties were selected to enable the prediction of the Lipinski Rule-of-Five profile or ‘druglikeness’ for each ligand. For more info on each category see the help pages.

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Hydrogen bond acceptors 6
Hydrogen bond donors 3
Rotatable bonds 9
Topological polar surface area 125.26
Molecular weight 479.16
XLogP 4.44
No. Lipinski's rules broken 0
SMILES / InChI / InChIKey
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SMILES / InChI / InChIKey

SMILES (Simplified Molecular Input Line Entry Specification) A specification for unambiguously describing the structure of chemical molecules using short ASCII strings. Canonical SMILES specify a unique representation of the 2D structure without chiral or isotopic specifications. Isomeric SMILES include chiral specification and isotopes.

Standard InChI (IUPAC International Chemical Identifier) and InChIKey InChI is a non-proprietary, standard, textual identifier for chemical substances designed to facilitate linking of information and database searching. An InChIKey is a simplified version of a full InChI, designed for easier web searching.

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Canonical SMILES COc1ccc(cc1C(=O)NCc1ccc(cc1)c1nn(c(c1C(=O)N)N)[C@H](C(F)(F)F)C)F
Isomeric SMILES COc1ccc(cc1C(=O)NCc1ccc(cc1)c1nn(c(c1C(=O)N)N)[C@H](C(F)(F)F)C)F
InChI InChI=1S/C22H21F4N5O3/c1-11(22(24,25)26)31-19(27)17(20(28)32)18(30-31)13-5-3-12(4-6-13)10-29-21(33)15-9-14(23)7-8-16(15)34-2/h3-9,11H,10,27H2,1-2H3,(H2,28,32)(H,29,33)/t11-/m0/s1
InChI Key FWZAWAUZXYCBKZ-NSHDSACASA-N
No information available.
Summary of Clinical Use Click here for help
Pirtobrutinib (LOXO-305) was progressed to clinical trial to determine efficacy in B cell malignancies. The FDA first approved its use in January 2023 [6], for the treatment of relapsed/refractory mantle cell lymphoma. EMA authorisation for this indication followed in April of the same year. FDA approval was expanded in late 2023 to include treatmant of chronic lymphocytic leukemia or small lymphocytic lymphoma (CLL/SLL; previously treated with ≥2 drugs, including a BTK inhibitor and a BCL-2 inhibitor).
Clinical Trials
Clinical Trial ID Title Type Source Comment References
NCT03740529 A Study of Oral LOXO-305 in Patients With Previously Treated CLL/SLL or NHL Phase 1/Phase 2 Interventional Eli Lilly and Company This study found that pirtobrutinib was safe and active in multiple B cell malignancies. It was effective in patients who had previously received treatment with covalent BTK inhibitors. 4,7