CAS No. 1083433-49-1

Batch: Purity:99.34
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S961 Chemical Structure
Chemical Structure
Check the S961 product page for in-depth specifications, including solubility, stock solutions, MOA, and working concentrations.

Chemical Information

IUPAC Name (4S)-4-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[2-[[2-[[(2S)-2-[[2-[[2-[[2-[[(2S)-2-[[(2S)-5-amino-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[(2-aminoacetyl)amino]-3-hydroxypropanoyl]amino]-4-methylpentanoyl]amino]-3-carboxypropanoyl]amino]-4-carboxybutanoyl]amino]-3-hydroxypropanoyl]amino]-3-phenylpropanoyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]-3-carboxypropanoyl]amino]-3-(1H-indol-3-yl)propanoyl]amino]-3-phenylpropanoyl]amino]-4-carboxybutanoyl]amino]-5-carbamimidamidopentanoyl]amino]-5-oxopentanoyl]amino]-4-methylpentanoyl]amino]acetyl]amino]acetyl]amino]acetyl]amino]-3-hydroxypropanoyl]amino]acetyl]amino]acetyl]amino]-3-hydroxypropanoyl]amino]-3-hydroxypropanoyl]amino]-4-methylpentanoyl]amino]-4-carboxybutanoyl]amino]-5-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S,3S)-1-[[(2S)-5-amino-1-[[(4R,10S,16S,19S,22S,25R)-10-(3-carbamimidamidopropyl)-22-(2-carboxyethyl)-4-[(2S)-2-[[(2S)-1-[[(1S)-1-carboxy-2-(4-hydroxyphenyl)ethyl]amino]-3-hydroxy-1-oxopropan-2-yl]carbamoyl]pyrrolidine-1-carbonyl]-16-(1H-indol-3-ylmethyl)-6,9,12,15,18,21,24-heptaoxo-19-propan-2-yl-1,2-dithia-5,8,11,14,17,20,23-heptazacyclohexacos-25-yl]amino]-1,5-dioxopentan-2-yl]amino]-3-methyl-1-oxopentan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1-oxopropan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-4-carboxy-1-oxobutan-2-yl]amino]-5-oxopentanoic acid
CAS Number 1083433-49-1
Molecular Formula

C211H297N55O71S2
Molecular Weight (MW) 4804.13
InChIKey IDFBWNQZXDXGGL-NROXGFMBSA-N

Ordering Information

Biological Activity

S961 is a biosynthetic peptide antagonist targeting the insulin receptor (IR). By effectively blocking insulin binding to the insulin receptor, S961 inhibits receptor autophosphorylation and disrupts downstream signaling cascades, including the AKT/mTOR and MAPK pathways. Consequently, S961 suppresses insulin-driven metabolic and survival signaling, resulting in decreased cellular proliferation and suppressed colony formation in breast tumor cells.

How to Prepare Stock Solution?

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Solubility

Batch:
All in vitro solubility values are batch-tested experimental data (non-literature values).
Solvent Solubility & Note
DMSO 100 mg/mL (20.81 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO. The recommended stock concentration is 10 mM in DMSO.)
Water Insoluble
Ethanol Insoluble
FAQ
Q: Why does a DMSO stock precipitate in media/saline?
A: It is caused by unheated aqueous media (supersaturation), local solvent shock, or incorrect mixing sequence.
How to fix it?
  • Preheat media/saline to 37°C.
  • Mix rapidly (pipette/vortex) upon addition.
  • For complex mixes, always add the aqueous phase last.
  • Re-dissolve minor precipitates with a 37°C water bath and sonication (≤30 min).

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Note: Technical data last updated: Sep 1, 2026.