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LOPAC®1280 (International Version)

Library of Pharmacologically Active Compounds

Quality Level

shipped in

dry ice

storage temp.


General description

Compounds are arranged in 96-well format in 16 racks of 80, one compound per well (250 μl at 10 mM in DMSO in archival storage racks).


LOPAC®1280 (International Version) has been used to screen chemical inhibitors with dephosphorylation activity. It has also been used in MyoScreen myotubes to screen for muscle regeneration molecules.

Features and Benefits

SDFile provided to construct a database containing:

  • Structure
  • Primary Name
  • Secondary Name
  • Pharmacological Activity
  • Sigma-RBI Product Number (for easy re-order)
  • Rack Position
Collection of approximately 1,280 pharmacologically active Sigma compounds.
Includes the latest, drug-like molecules in the fields of Cell Signaling & Neuroscience:

  • Apotosis
  • G Proteins & Cyclic Nucleotides
  • Gene Regulation & Expression
  • Ion Channels
  • Lipid Signaling
  • Multi-drug Resistance
  • Neurotransmission
  • Phosphorylation

Other Notes

For sale outside of the U.S. only. U.S. customers should refer to Product Code LO1280.

Legal Information

LOPAC is a registered trademark of Sigma-Aldrich Co. LLC

Signal Word


Hazard Classifications

Acute Tox. 1 Inhalation - Acute Tox. 2 Dermal - Acute Tox. 2 Oral - Aquatic Acute 1 - Aquatic Chronic 1 - Carc. 1A - Eye Dam. 1 - Lact. - Muta. 1B - Repr. 1A - Resp. Sens. 1 - Skin Irrit. 2 - Skin Sens. 1 - STOT RE 2 - STOT SE 2

Storage Class Code

6.1A - Combustible, acute toxic Cat. 1 and 2 / very toxic hazardous materials



Flash Point(F)

188.6 °F - closed cup

Flash Point(C)

87 °C - closed cup

Certificate of Analysis

Certificate of Origin

Temperature-sensitive substrate and product binding underlie temperature-compensated phosphorylation in the clock
Shinohara Y, et al.
Molecular Cell, 67(5), 783-798 (2017)
MyoScreen, a High-Throughput Phenotypic Screening Platform Enabling Muscle Drug Discovery
Young J, et al.
SLAS discovery, 23(8), 790-806 (2018)
Jaime Freitas et al.
Current chemical genomics and translational medicine, 8, 36-46 (2014-04-29)
To adapt the use of GH3.TRE-Luc reporter gene cell line for a quantitative high-throughput screening (qHTS) platform, we miniaturized the reporter gene assay to a 1536-well plate format. 1280 chemicals from the Library of Pharmacologically Active Compounds (LOPAC) and the
Linda Rickardson et al.
Journal of biomolecular screening, 12(2), 203-210 (2007-01-09)
The proteasome is a new, interesting target in cancer drug therapy, and the proteasome inhibitor bortezomib has shown an effect in myeloma patients. It is of interest to efficiently discover and evaluate new proteasome inhibitors. The authors describe the development
Houtan Moshiri et al.
Journal of biomolecular screening, 20(1), 92-100 (2014-08-30)
Most mitochondrial messenger RNAs in trypanosomatid pathogens undergo a unique type of posttranscriptional modification involving insertion and/or deletion of uridylates. This process, RNA editing, is catalyzed by a multiprotein complex (~1.6 MDa), the editosome. Knockdown of core editosome proteins compromises


Compound Library Screening with LOPAC®1280 Small Molecules

Learn about compound library screening and explore our compound libraries, including our Library of Pharmacologically Active Compounds (LOPAC®1280) portfolio to experience the gold-standard collection of biologically annotated, ready-to-screen compounds.

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