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4-(3-Tosyl-2-(tosylmethyl)propanoyl)benzoic acid (Bis-sulfone Acid) is a strong covalent linker containing a free carboxylic acid and two tosyl groups. 4-(3-Tosyl-2-(tosylmethyl)propanoyl)benzoic acid permits sequential displacement of each tosyl group by thiol or amine nucleophiles through Michael addition. 4-(3-Tosyl-2-(tosylmethyl)propanoyl)benzoic acid enables covalent “stapling” of two reduced cysteine residues on a protein to restore disulfide bridges, while the free carboxylic acid can be transformed into amides or esters, making the molecule a versatile tool for protein engineering and bioconjugation.

| Pack Size | Price | USA Warehouse | Global Warehouse | Quantity |
|---|---|---|---|---|
| 10 mg | $30 | - | In Stock | |
| 25 mg | $53 | - | In Stock | |
| 50 mg | $80 | - | In Stock | |
| 100 mg | $118 | - | In Stock |
| Description | 4-(3-Tosyl-2-(tosylmethyl)propanoyl)benzoic acid (Bis-sulfone Acid) is a strong covalent linker containing a free carboxylic acid and two tosyl groups. 4-(3-Tosyl-2-(tosylmethyl)propanoyl)benzoic acid permits sequential displacement of each tosyl group by thiol or amine nucleophiles through Michael addition. 4-(3-Tosyl-2-(tosylmethyl)propanoyl)benzoic acid enables covalent “stapling” of two reduced cysteine residues on a protein to restore disulfide bridges, while the free carboxylic acid can be transformed into amides or esters, making the molecule a versatile tool for protein engineering and bioconjugation. |
| Synonyms | Bis-sulfone Acid |
| Molecular Weight | 500.58 |
| Formula | C25H24O7S2 |
| Cas No. | 124243-00-1 |
| Smiles | O=C(O)C1=CC=C(C=C1)C(=O)C(CS(=O)(=O)C2=CC=C(C=C2)C)CS(=O)(=O)C3=CC=C(C=C3)C |
| Storage | Powder: -20°C for 3 years | In solvent: -80°C for 1 year | |||||||||||||||||||||||||||||||||||
| Solubility Information | DMSO: 80.00 mg/mL (159.81 mM), Sonication is recommended. | |||||||||||||||||||||||||||||||||||
Solution Preparation Table | ||||||||||||||||||||||||||||||||||||
DMSO
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Dissolve 2 mg of the compound in 100 μL DMSO
to obtain a stock solution at a concentration of 20 mg/mL . If the required concentration exceeds the compound's known solubility, please contact us for technical support before proceeding.
1) Add 100 μL of the DMSO
stock solution to 400 μL PEG300
and mix thoroughly until the solution becomes clear.
2) Add 50 μL Tween 80 and mix well until fully clarified.
3) Add 450 μL Saline,PBS or ddH2O
and mix thoroughly until a homogeneous solution is obtained.
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