SML0778 Sigma-Aldrich


≥98% (HPLC)

Synonym: 1-Isopropyl-6-(6-(4-isopropylpiperazin-1-yl)pyridin-3-yl)-N-((6-methyl-2-oxo-4-propyl-1,2-dihydropyridin-3-yl)methyl)-1H-indazole-4-carboxamide

  • CAS Number 1431612-23-5

  • Empirical Formula (Hill Notation) C33H43N7O2

  • Molecular Weight 569.74

  •  MDL number MFCD26960958

  •  PubChem Substance ID 329825598

  •  NACRES NA.77



Related Categories Bioactive Small Molecule Alphabetical Index, Bioactive Small Molecules, Cell Biology, Cell Signaling and Neuroscience, DNA-RNA Transcription Regulators,
Quality Level   100
assay   ≥98% (HPLC)
form   powder
color   white to beige
solubility   DMSO: 15 mg/mL, clear
storage temp.   2-8°C
SMILES string   CC(C)N1CCN(C2=NC=C(C3=CC4=C(C=NN4C(C)C)C(C(NCC5=C(CCC)C=C(C)NC5=O)=O)=C3)C=C2)CC1
InChI   1S/C33H43N7O2/c1-7-8-24-15-23(6)37-33(42)28(24)19-35-32(41)27-16-26(17-30-29(27)20-36-40(30)22(4)5)25-9-10-31(34-18-25)39-13-11-38(12-14-39)21(2)3/h9-10,15-18,20-22H,7-8,11-14,19H2,1-6H3,(H,35,41)(H,37,42)



5, 25 mg in glass bottle

Biochem/physiol Actions

The polycomb repressive complex 2 (PRC2), which represses gene expression through methylation of histone H3 on lysine 27 (H3K27), contains either EZH1 or EZH2 as its catalytic subunit, with EZH1 being found in both dividing and non-dividing cells, whereas EZH2 is only found in actively dividing cells. UNC1999 is an orally bioavaliable selective inhibitor of both EZH2 and EZH1 lysine methyltransferases with IC50 < 10 nM for EZH2 and 45 nM for EZH1. UNC1999 potently inhibited both wild-type and mutant Y641N EZH2 methyltransferase activity with less than a 5-fold difference in potency, and selectively killed diffused large B cell lymphoma (DLBCL) cells bearing Y641 point mutations. It was selective for EZH2 and EZH1 over 15 other lysine, arginine and DNA methyltransferases. UNC1999 is competitive with the cofactor S-adenosylmethionine (SAM) and non-competitive with the peptide substrate. Because it inhibits both EZH2 and EZH1, UNC1999 has potential advantages over EZH2 selective inhibitors in the disease settings where both PRC2 – EZH2 and PRC2 – EZH1 contribute to the methylation of H3K27.

For full characterization details, please visit the UNC1999 probe summary on the Structural Genomics Consortium (SGC) website.

UNC2400 is the negative control for the active probe, UNC1999. To request a sample of the negative control from the SGC, click here.

To learn about other SGC chemical probes for epigenetic targets, visit

Features and Benefits

This compound is a featured product for Gene Regulation research. Click here to discover more featured Gene Regulation products. Learn more about bioactive small molecules for other areas of research at

UNC1999 is an epigenetic chemical probe available through a partnership with the Structural Genomics Consortium (SGC). To learn more and view other SGC epigenetic probes, visit

Other Notes

UNC1999 has been expertly reviewed and recommended by the Chemical Probes Portal. For more information, please visit the UNC1999 probe summary on the Chemical Probes Portal website.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Protocols & Articles


Discover Bioactive Small Molecules for Gene Regulation

The loss of regulation of gene expression is a key component to many human disease states, including neurodegenerative disorders, autoimmune conditions and, most prominently, cancers. Regulation of g...
Keywords: Acetylations, Epigenetics, Gene expression, Genomics, Methylations, PAGE, Post translational modifications, Transcription

Peer-Reviewed Papers


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