C1055 Sigma-Aldrich


Synonym: (±)-trans-6-Cyano-3,4-dihydro-2,2-dimethyl-4-(2-oxopyrrolidin-1-yl)-2H-1-benzopyran-3-ol

  • CAS Number 94470-67-4

  • Empirical Formula (Hill Notation) C16H18N2O3

  • Molecular Weight 286.33

  •  MDL number MFCD00133201

  •  PubChem Substance ID 24891962

  •  NACRES NA.77



Related Categories Bioactive Small Molecule Alphabetical Index, Bioactive Small Molecules, CI-CZ, Cell Biology, Cell Signaling and Neuroscience,
Quality Level   200
storage temp.   2-8°C
SMILES string   CC1(C)Oc2ccc(cc2[C@H]([C@@H]1O)N3CCCC3=O)C#N
InChI   1S/C16H18N2O3/c1-16(2)15(20)14(18-7-3-4-13(18)19)11-8-10(9-17)5-6-12(11)21-16/h5-6,8,14-15,20H,3-4,7H2,1-2H3/t14-,15+/m1/s1
Gene Information   rat ... Kcna1(24520), Kcnj1(24521), Kcnj5(29713), Kcnj8(25472)



Cromakalim has been used:
• as a potassium channel agonist to study its response to an acute increase in downstream pressure in rat lymphatic vessels.
• as a potassium channel opener to study its effects on the release of transmitters from adrenergic nerves in rat vas deferens.
• as a potassium channel activator to study its effects on the release of transmitters from purinergic and cholinergic nerves in the rat detrusor muscle.


10, 50 mg in glass bottle

Biochem/physiol Actions

Cromakalim is an activator of the potassium channel. It is involved in the relaxation of the vascular smooth muscles. Cromakalim exhibits anti-hypertensive activity.

Features and Benefits

This compound is featured on the Potassium Channels page of the Handbook of Receptor Classification and Signal Transduction. To browse other handbook pages, click here.

Safety & Documentation

Safety Information

Personal Protective Equipment 
NONH for all modes of transport
WGK Germany 
Flash Point(F) 
Not applicable
Flash Point(C) 
Not applicable


Certificate of Analysis (COA)

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Frequently Asked Questions

How does the storage temperature relate to shipping conditions?
The storage conditions that a Sigma-Aldrich catalog and label recommend for products are deliberately conservative. For many products, long-term storage at low temperatures will increase the time during which they are expected to remain in specification and therefore are labeled accordingly. Where short-term storage, shipping time frame, or exposure to conditions other than those recommended for long-term storage will not affect product quality, Sigma-Aldrich will ship at ambient temperature. The products sensitive to short-term exposure to conditions other than their recommended long-term storage are shipped on wet or dry ice. Ambient temperature shipping helps to control shipping costs for our customers. At any time, our customers can request wet- or dry-ice shipment, but the special handling is at customer expense if our product history indicates that the product is stable for regular shipment. See Shipping and Storage for more information.
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.
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.
How do I find price and availability?
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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.
Can I dissolve Product C1055, Cromakalim, in something else besides chloroform?
Yes. One publication reports that Product C1055, Cromakalim, can be dissolved in DMSO at 20 mM. Post, J.M., et al., Effect of cromakalim and lemakalim on slow waves and membrane currents in colonic smooth muscle. Am. J. Physiol. Cell. Physiol., 260(2), C375-C382(1991).
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