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NHS, 1-Hydroxy-2,5-pyrrolidinedione, HOSu
Empirical Formula (Hill Notation):
CAS Number:
Molecular Weight:
EC Number:
MDL number:
PubChem Substance ID:

Quality Level






95-98 °C (lit.)

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N-Hydroxysuccinimide has been used in the synthesis of intermediates such as:
  • N

  • -succinimidyl 3-(di-tert-butylfluorosilyl)benzoate
  • 4-[2,2-bis[(p-tolylsulfonyl)-methyl] acetyl]benzoic acid-NHS ester
  • N-succinimidyl 3-iodobenzoate

It has also been used in a protocol for the surface modification of microchannels of a microfluidic-integrated surface plasmon resonance (SPR) platform for the detection and quantification of bacterial pathogens.
Additive used in the carbodiimide method for improved amidations and peptide couplings.
N-Hydroxysuccinimide can be used in the synthesis of N-hydroxysuccinimide ester via dehydration reaction in the presence of dicyclohexylcarbodiimide in carboxylic acid.


5, 25, 100, 250 g in poly bottle
1 kg in poly bottle
5 kg in poly drum

Storage Class Code

11 - Combustible Solids



Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificate of Analysis

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Certificate of Origin

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  1. Which document(s) contains shelf-life or expiration date information for a given product?

    If available for a given product, the recommended re-test date or the expiration date can be found on the Certificate of Analysis.

  2. How do I get lot-specific information or a Certificate of Analysis?

    The lot specific COA document can be found by entering the lot number above under the "Documents" section.

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  4. What is the Department of Transportation shipping information for this product?

    Transportation information can be found in Section 14 of the product's (M)SDS.To access the shipping information for this material, use the link on the product detail page for the product. 

  5. What is the solution stability of Product 130672, N-Hydroxysuccinimide?

    Sigma-Aldrich does not evaluate 130672 for solution stability. Therefore, it is advisable to prepare a solution fresh for each use. Please note, the product is moisture sensitive.

  6. What is the purity of Product 130672, N-Hydroxysuccinimide?

    The purity is lot specific and will be stated on the Specification Sheet.

  7. Does N-Hydroxysuccinimide go by any other names?

    Yes, N-Hydroxysuccinimide is also referred to by the acronym NHS and is also referred to by the synonyms 1-Hydroxy-2,5-pyrrolidinedione and HOSu.

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Preparation of N-succinimidyl 3-[* I] iodobenzoate: an agent for the indirect radioiodination of proteins.
Vaidyanathan G
Nature Protocols, 1(2), 707-707 (2006)
Zbigniew Czajgucki et al.
Journal of peptide science : an official publication of the European Peptide Society, 12(10), 653-662 (2006-07-19)
Edeines are pentapeptide amide antibiotics composed of four nonprotein amino acids, glycine, and polyamine. They exhibit antimicrobial and immunosuppressive activities and are universal inhibitors of translation. Moreover, it was proven that the free ionizable carboxy group in the (2R, 6S
PEGylation of native disulfide bonds in proteins.
Brocchini S
Nature Protocols, 1(5), 2241-2241 (2006)
Pico Y et al.
Food Toxicants Analysis: Techniques, Strategies and Developments (2007)
D Sehgal et al.
Analytical biochemistry, 218(1), 87-91 (1994-04-01)
Water-soluble carbodiimides are widely used for carboxyl-amine conjugation. However, extremely variable and low yields, obtained under a variety of conditions, have been a serious problem in the coupling. A simple method, optimizing various parameters of the coupling reaction, in which


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