SMILES:

CC(C)CC1NC(=O)C(C)NC(=O)C(NC(=O)C(CCC(O)=O)NC(=O)C2CCCN2C(=O)C(C)NC(=O)C(CCCCN)NC(=O)C3CSSCC(NC(=O)C(CCCNC(N)=N)NC(=O)C(CCCNC(N)=N)NC(=O)C(C)NC(=O)C(CSSCC(N)C(=O)NC(CC(N)=O)C(=O)N3)NC1=O)C(=O)NC(CCC(N)=O)C(=O)NC(CCC(N)=O)C(=O)NC(CC4=CN=C[NH]4)C(N)=O)C(C)O
Apamin Chemical Structure
Chemical Structure
Check the Apamin product page for in-depth specifications, including solubility, stock solutions, MOA, and working concentrations.

Chemical Information

IUPAC Name 3-[(1R,4S,7S,13S,16S,19S,22S,25S,28R,31S,34S,37S,40R,47S,50R)-50-amino-40-[[(2S)-5-amino-1-[[(2S)-5-amino-1-[[(2S)-1-amino-3-(1H-imidazol-4-yl)-1-oxopropan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-1,5-dioxopentan-2-yl]carbamoyl]-4-(4-aminobutyl)-47-(2-amino-2-oxoethyl)-34,37-bis(3-carbamimidamidopropyl)-19-[(1R)-1-hydroxyethyl]-7,22,31-trimethyl-25-(2-methylpropyl)-2,5,8,14,17,20,23,26,29,32,35,38,46,49-tetradecaoxo-42,43,52,53-tetrathia-3,6,9,15,18,21,24,27,30,33,36,39,45,48-tetradecazatricyclo[26.16.10.09,13]tetrapentacontan-16-yl]propanoic acid
CAS Number 24345-16-2
Molecular Formula

C79H131N31O24S4
Molecular Weight (MW) 2027.35
SMILES CC(C)CC1NC(=O)C(C)NC(=O)C(NC(=O)C(CCC(O)=O)NC(=O)C2CCCN2C(=O)C(C)NC(=O)C(CCCCN)NC(=O)C3CSSCC(NC(=O)C(CCCNC(N)=N)NC(=O)C(CCCNC(N)=N)NC(=O)C(C)NC(=O)C(CSSCC(N)C(=O)NC(CC(N)=O)C(=O)N3)NC1=O)C(=O)NC(CCC(N)=O)C(=O)NC(CCC(N)=O)C(=O)NC(CC4=CN=C[NH]4)C(N)=O)C(C)O
InChIKey YVIIHEKJCKCXOB-STYWVVQQSA-N

How to Prepare Stock Solution?

Concentration Volume Mass
🧮 Molarity Calculator

Solubility

Batch:
All in vitro solubility values are batch-tested experimental data (non-literature values).
Solvent Solubility & Note
DMSO 100 mg/mL (49.32 mM)
(Moisture-contaminated DMSO may reduce solubility. Use fresh, anhydrous DMSO. The recommended stock concentration is 10 mM in DMSO.)
Water 100 mg/mL
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.