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Pathways Recommended:	PROTAC

Results for "

PROTAC warhead

" in MedChemExpress (MCE) Product Catalog:

By Targets:	Ligands for Target Protein for PROTAC (5) Epigenetic Reader Domain (5) PARP (1) Phosphatase (1) PROTACs (4) Ras (1) Reference Standards (2) α-synuclein (1)
By Research Areas:	Cancer (8) Neurological Disease (1)

Inhibitors & Agonists

Screening Libraries

Targets Recommended: PROTAC-Linker Conjugates for PAC PROTAC Linkers Ligands for Target Protein for PROTAC

Cat. No.	Product Name	Target	Research Areas	Chemical Structure

HY-137516

LC-2 2 Publications Verification	PROTACs Ras	Cancer
LC-2 is a potent and first-in-class von Hippel-Lindau-based PROTAC capable of degrading endogenous KRAS G12C, with DC₅₀s between 0.25 and 0.76 μM . LC-2 covalently binds KRAS G12C with a MRTX849 warhead and recruits the E3 ligase VHL, inducing rapid and sustained KRAS G12C degradation leading to suppression of MAPK signaling in both homozygous and heterozygous KRAS G12C cell lines .

HY-107443

I-BET762 carboxylic acid Molibresib carboxylic acid; GSK525762A carboxylic acid; PROTAC BRD4-binding moiety 2	Ligands for Target Protein for PROTAC Epigenetic Reader Domain	Cancer
I-BET762 carboxylic acid (Molibresib carboxylic acid) is an I-BET762-based warhead ligand for conjugation reactions of PROTAC targeting on BET. I-BET762 carboxylic acid (Molibresib carboxylic acid) is a BRD4 inhibitor with a pIC₅₀ of 5.1 .

HY-164977

JCS-1	PROTACs Phosphatase	Cancer
JCS-1 is a potent DcpS PROTAC degrader. JCS-1 non-covalently binds DcpS with a RG3039-based warhead and recruits the E3 ligase VHL. JCS-1 promotes ubiquitination and degradation of DcpS at nanomolar concentrations (DC₅₀ in MOLM-14 cells: 87 nM). JCS-1 can be used for the research of AML and other DcpS-dependent genetic disorders .

HY-107443A

(R)-I-BET762 carboxylic acid (R)-Molibresib carboxylic acid; (R)-GSK525762A carboxylic acid; (R)-PROTAC BRD4-binding moiety 2	Ligands for Target Protein for PROTAC Epigenetic Reader Domain	Cancer
(R)-I-BET762 carboxylic acid, the R-enantiomer of I-BET762 carboxylic acid (HY-107443). I-BET762 carboxylic acid is an I-BET762-based warhead ligand for conjugation reactions of PROTAC targeting on BET. I-BET762 carboxylic acid is a BRD4 inhibitor with a pIC₅₀ value of 5.1 .

HY-107443R

I-BET762 carboxylic acid (Standard) Molibresib carboxylic acid (Standard); GSK525762A carboxylic acid (Standard); PROTAC BRD4-binding moiety 2 (Standard)	Reference Standards Ligands for Target Protein for PROTAC Epigenetic Reader Domain	Cancer
I-BET762 carboxylic acid (Standard) is the analytical standard of I-BET762 carboxylic acid (HY-107443). This product is intended for research and analytical applications. I-BET762 carboxylic acid (Molibresib carboxylic acid) is an I-BET762-based warhead ligand for conjugation reactions of PROTAC targeting on BET. I-BET762 carboxylic acid (Molibresib carboxylic acid) is a BRD4 inhibitor with a pIC₅₀ of 5.1 .

HY-107443AR

(R)-I-BET762 carboxylic acid (Standard) (R)-Molibresib carboxylic acid (Standard); (R)-GSK525762A carboxylic acid (Standard); (R)-PROTAC BRD4-binding moiety 2 (Standard)	Reference Standards Ligands for Target Protein for PROTAC Epigenetic Reader Domain	Cancer
(R)-I-BET762 carboxylic acid (Standard) is the analytical standard of (R)-I-BET762 carboxylic acid (HY-107443A). This product is intended for research and analytical applications. (R)-I-BET762 carboxylic acid, the R-enantiomer of I-BET762 carboxylic acid (HY-107443). I-BET762 carboxylic acid is an I-BET762-based warhead ligand for conjugation reactions of PROTAC targeting on BET. I-BET762 carboxylic acid is a BRD4 inhibitor with a pIC₅₀ value of 5.1 .

HY-130646

iVeliparib-AP6	PROTACs PARP	Cancer
iVeliparib-AP6 is a proteolysis-targeting chimera (PROTAC) molecule designed based on Veliparib (HY-10129), which targets PARP1/2. The DC₅₀s of iVeliparib-AP6 for inducing the degradation of PARP1 and PARP2 are 36 nM and 63 nM, respectively, and its IC₅₀s are 69 nM and 21 nM, respectively. iVeliparib-AP6 contains a Veliparib-based PARP inhibitor warhead linked to a CRBN E3 ligase binder; it uses Thalidomide (HY-14658) as a ligand to recruit CRBN E3 ubiquitin ligase and exerts the PARP2 degradation mechanism .

HY-180976

Arg-PEG1-Tαsyn	PROTACs α-synuclein	Neurological Disease
Arg-PEG1-Tαsyn is an α-syn *PROTAC* degrader with a DC₅₀ of 0.28 μM in U251 cells. Arg-PEG1-Tαsyn employs the amino acid arginine (Arg) as the E3 ligase UBR1 ligand and a benzothiazole-aniline variant as the warhead for α-syn. Arg-PEG1-Tαsyn significantly reduces α-syn aggregates and improves the dopaminergic neuronal impairment and the locomotion with safety profile in vivo.Arg-PEG1-Tαsyn shows the high degradation effect in mammalian cells for both wild-type α-syn and the α-syn (A53T) mutant. Arg-PEG1-Tαsyn can be used for Parkinson’s disease research .

HY-184339

BRD4-IN-42	Ligands for Target Protein for PROTAC Epigenetic Reader Domain	Cancer
BRD4-IN-42 is a BRD4 BD1 inhibitor with an IC₅₀ of 108.50 nM. BRD4-IN-42 can be used for the synthesis of PROTACs and serves as the target protein moiety of PROTAC BET Degrader-18 (HY-184335). BRD4-IN-42 inhibits the proliferation of wild-type and SHP099-resistant acute myeloid leukemia cells. BRD4-IN-42 is applicable to research related to acute myeloid leukemia .

Cat. No.	Product Name

HY-L945

Sulfonyl Fluoride Fragment Library	1162 compounds
Sulfonyl fluoride (-SO₂F) overcomes the poor target selectivity of traditional covalent warheads that rely heavily on cysteine. With high stability and tunable electrophilicity under physiological conditions, it targets multiple nucleophilic residues including Lys, Tyr, Ser and His, offering expanded druggable space, lower off-target risks and prolonged efficacy. It is widely used in covalent inhibitors, molecular glues, PROTACs and chemical probes. MCE has built a highly diverse sulfonyl fluoride fragment library with 1,162 structurally diverse, drug-like fragments. Designed for balanced reactivity, stability and compatibility, these molecules feature tunable electrophilicity, simple scaffolds and high derivatization potential. Combined with SuFEx click chemistry, the library enables efficient modular modification and rapid structure optimization. Ideal for targeting non-cysteine residues, this library improves covalent screening and probe development efficiency, serving as a precise tool for early-stage covalent drug discovery and chemical biology research.

Sulfonyl Fluoride Fragment Library

1162 compounds

Sulfonyl fluoride (-SO₂F) overcomes the poor target selectivity of traditional covalent warheads that rely heavily on cysteine. With high stability and tunable electrophilicity under physiological conditions, it targets multiple nucleophilic residues including Lys, Tyr, Ser and His, offering expanded druggable space, lower off-target risks and prolonged efficacy. It is widely used in covalent inhibitors, molecular glues, PROTACs and chemical probes.

MCE has built a highly diverse sulfonyl fluoride fragment library with 1,162 structurally diverse, drug-like fragments. Designed for balanced reactivity, stability and compatibility, these molecules feature tunable electrophilicity, simple scaffolds and high derivatization potential. Combined with SuFEx click chemistry, the library enables efficient modular modification and rapid structure optimization.

Ideal for targeting non-cysteine residues, this library improves covalent screening and probe development efficiency, serving as a precise tool for early-stage covalent drug discovery and chemical biology research.

HY-L934

CRBN Ligand Library	121 compounds
CRBN, namely cereblon, is the substrate recognition subunit of the E3 ubiquitin ligase complex in the ubiquitin-proteasome system. A CRBN ligand library refers to a collection of numerous fragments that can specifically bind to the CRBN protein. These ligands are mostly designed based on validated CRBN-binding warheads and modified through AI-driven molecular generation optimization systems. They not only include classic lenalidomide-derived structures but also cover novel non-lenalidomide scaffolds. After drug-likeness filtering, these ligands exhibit structural diversity and favorable druggable properties. They can be further optimized and modified to facilitate the development of novel molecular glue degraders, accelerate the discovery of molecular glues that induce interactions between CRBN and new substrate proteins, and enable the exploration of novel CRBN substrates for identifying previously unknown CRBN-binding proteins. MCE compiles 121 fragments that can specifically bind to the CRBN protein, with molecular weights ranging from 200 to 500. Compounds developed based on the library ligands target multiple disease targets such as cancer and autoimmune diseases, further advancing the development of Molecular Glues and PROTACs therapeutic agents.

CRBN Ligand Library

121 compounds

CRBN, namely cereblon, is the substrate recognition subunit of the E3 ubiquitin ligase complex in the ubiquitin-proteasome system. A CRBN ligand library refers to a collection of numerous fragments that can specifically bind to the CRBN protein.

These ligands are mostly designed based on validated CRBN-binding warheads and modified through AI-driven molecular generation optimization systems. They not only include classic lenalidomide-derived structures but also cover novel non-lenalidomide scaffolds. After drug-likeness filtering, these ligands exhibit structural diversity and favorable druggable properties. They can be further optimized and modified to facilitate the development of novel molecular glue degraders, accelerate the discovery of molecular glues that induce interactions between CRBN and new substrate proteins, and enable the exploration of novel CRBN substrates for identifying previously unknown CRBN-binding proteins.

MCE compiles 121 fragments that can specifically bind to the CRBN protein, with molecular weights ranging from 200 to 500. Compounds developed based on the library ligands target multiple disease targets such as cancer and autoimmune diseases, further advancing the development of Molecular Glues and PROTACs therapeutic agents.

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BODIPY 493/503 purchased from MedChemExpress. Usage Cited in: Nat Commun. 2025 Feb 1;16(1):1241. [Abstract]

MedchemExpress Validation 01

Western blot analysis of extracts from THP-1(lane 2(20μg), Jurkat (lane 3(20μg) and NIH3T3(lane 4(20μg) using FOXO1A (HY-P80132) Rabbit mAb. Proteins were transferred to a PVDF membrane and blocked with 5% non-fat milk in TBST for 2 hour at room temperature. The primary antibody (1/1000) and Loading control antibody (Beta Actin, HY-P80438, 1/10000) was used in 5% non-fat milk in TBST at 4°C overnight. Goat Anti-Mouse/Rabbit IgG-HRP Secondary Antibody (1/10000) was used for 1 hour at room temperature. Western blot analysis of extracts from THP-1(lane 2(20μg), Jurkat (lane 3(20μg) and NIH3T3(lane 4(20μg) using FOXO1A (HY-P80132) Rabbit mAb. Proteins were transferred to a PVDF membrane and blocked with 5% non-fat milk in TBST for 2 hour at room temperature. The primary antibody (1/1000) and Loading control antibody (Beta Actin, HY-P80438, 1/10000) was used in 5% non-fat milk in TBST at 4°C overnight. Goat Anti-Mouse/Rabbit IgG-HRP Secondary Antibody (1/10000) was used for 1 hour at room temperature. Western blot analysis of extracts from THP-1(lane 2(20μg), Jurkat (lane 3(20μg) and NIH3T3(lane 4(20μg) using FOXO1A (HY-P80132) Rabbit mAb. Proteins were transferred to a PVDF membrane and blocked with 5% non-fat milk in TBST for 2 hour at room temperature. The primary antibody (1/1000) and Loading control antibody (Beta Actin, HY-P80438, 1/10000) was used in 5% non-fat milk in TBST at 4°C overnight. Goat Anti-Mouse/Rabbit IgG-HRP Secondary Antibody (1/10000) was used for 1 hour at room temperature.

BODIPY 493/503 purchased from MedChemExpress. Usage Cited in: Nat Commun. 2025 Feb 1;16(1):1241. [Abstract]

MedchemExpress Validation 01

MedchemExpress Validation 03

Western blot analysis of extracts from THP-1(lane 2(20μg), Jurkat (lane 3(20μg) and NIH3T3(lane 4(20μg) using FOXO1A (HY-P80132) Rabbit mAb. Proteins were transferred

MedchemExpress Validation 04

MedchemExpress Validation

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