SML1972 Sigma-Aldrich


≥98% (HPLC)

Synonym: (2R,3R,4S,5R)-2-(4-Amino-7H-pyrrolo[2,3-d]pyrimidin-7-yl)-5-((R)-hydroxy(phenyl)methyl)tetrahydrofuran-3,4-diol, (R)-5′-phenyl-7-deazaadenosine; 6-amino-9-[(R)-5′-phenyl(ribofuranosyl)]-7-deazapurine, LLY 283, LLY283

  • CAS Number 2040291-27-6

  • Empirical Formula (Hill Notation) C17H18N4O4

  • Molecular Weight 342.35

  •  NACRES NA.77



Related Categories Bioactive Small Molecule Alphabetical Index, Bioactive Small Molecules, Cell Biology, L
assay   ≥98% (HPLC)
form   powder
color   white to beige
storage temp.   2-8°C
SMILES string   O[C@@H]1[C@@H]([C@H](O)C2=CC=CC=C2)O[C@@H](N3C(N=CN=C4N)=C4C=C3)[C@@H]1O


Biochem/physiol Actions

LLY-283 is a potent and selective SAM-competitive PRMT5 inhibitor (IC50 = 20 nM against PRMT5-catalyzed methylation of an H4R3-derived peptide substrate) with greater than 100-fold selectivity over other histone methyltransferases and non-epigenetic targets. LLY-283 inhibits Smith (Sm) antigen SmBB’ methylation in MCF7 cells (IC50 = 25 nM; 3 days) and affects MDM4 splicing in A375 cells (IC50 = 40 nM; 3 days). The diastereomer LLY-284 is less potent in the biochemical assay and is an ideal control compound for cellular studies. For characterization details of LLY-283, please visit the LLY-283 probe summary on the Structural Genomics Consortium (SGC) website.

LLY-284 is the negative control for the active probe, LLY-283. LLY-284 is available from Sigma. To learn more about and purchase LLY-284, click here.

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

Features and Benefits

LLY-283 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

Safety & Documentation

Safety Information

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


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