L 691121

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MedKoo CAT#: 596651

CAS#: 136075-60-0

Description: L 691121 is a class III antiarrhythmic agent which blocks potassium currents.

Price and Availability

Size Price Shipping out time Quantity
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Pricing updated 2020-04-01. Prices are subject to change without notice.

L 691121 is not in stock, may be available through custom synthesis. For cost-effective reason, minimum 1 gram order is requested. The product will be characterized by NMR, HPLC and MS analysis. Purity (HPLC) is usually >98%. CoA, QC data, MSDS will be provided when product is successfully made. The estimated lead time is 2-3 months. Please send email to sales@medkoo.com to inquire quote.

Chemical Structure


Theoretical Analysis

MedKoo Cat#: 596651
Name: L 691121
CAS#: 136075-60-0
Chemical Formula: C22H25ClN4O5S
Exact Mass:
Molecular Weight: 492.97
Elemental Analysis: C, 53.60; H, 5.11; Cl, 7.19; N, 11.37; O, 16.23; S, 6.50

Synonym: L 691121; L-691121; L691121; L-691,121; L 691,121; L691,121;

IUPAC/Chemical Name: N-(1'-(2-(benzo[c][1,2,5]oxadiazol-5-yl)ethyl)-4-oxospiro[chromane-2,4'-piperidin]-6-yl)methanesulfonamide hydrochloride


InChi Code: InChI=1S/C22H24N4O5S.ClH/c1-32(28,29)25-16-3-5-21-17(13-16)20(27)14-22(30-21)7-10-26(11-8-22)9-6-15-2-4-18-19(12-15)24-31-23-18;/h2-5,12-13,25H,6-11,14H2,1H3;1H

SMILES Code: CS(=O)(NC1=CC=C2C(C(CC3(CCN(CCC4=CC5=NON=C5C=C4)CC3)O2)=O)=C1)=O.[H]Cl

Technical Data

Solid powder

>98% (or refer to the Certificate of Analysis)

Shipping Condition:
Shipped under ambient temperature as non-hazardous chemical. This product is stable enough for a few weeks during ordinary shipping and time spent in Customs.

Storage Condition:
Dry, dark and at 0 - 4 C for short term (days to weeks) or -20 C for long term (months to years).

Soluble in DMSO

Shelf Life:
>2 years if stored properly

Drug Formulation:
This drug may be formulated in DMSO

Stock Solution Storage:
0 - 4 C for short term (days to weeks), or -20 C for long term (months).

HS Tariff Code:


1: Zaniboni M, Pollard AE, Yang L, Spitzer KW. Beat-to-beat repolarization variability in ventricular myocytes and its suppression by electrical coupling. Am J Physiol Heart Circ Physiol. 2000 Mar;278(3):H677-87. PubMed PMID: 10710334.

2: Greber TF, Olah TV, Gilbert JD, Porras AG, Hichens M. Determination of L-691,121, a new class III antiarrhythmic, and its principal metabolite in plasma by differential radioimmunoassay. J Pharm Biomed Anal. 1994 Apr;12(4):483-92. PubMed PMID: 7918764.

3: Ban Y, Konishi R, Kawana K, Nakatsuka T, Fujii T, Manson JM. Embryotoxic effects of L-691,121, a class III antiarrhythmic agent, in rats. Arch Toxicol. 1994;69(1):65-71. PubMed PMID: 7717857.

4: Lynch JJ Jr, Wallace AA, Van der Gaag LH, Baskin EP, Bear CM, Gehret JR, Kothstein T, Stupienski RF, Appleby SD, Sanguinetti MC, et al. Cardiac electrophysiologic and antiarrhythmic actions of 3,4-dihydro-1'-[2-(benzofurazan-5-yl) ethyl]-6-methanesulfonamidospiro [(2H)-1-benzopyran-2,4'-piperidin]-4-one HCl (L-691,121), a novel class III agent. J Pharmacol Exp Ther. 1993 May;265(2):720-30. PubMed PMID: 8496818.

5: Vickers S, Duncan CA, Kari PH, Homnick CF, Elliott JM, Pitzenberger SM, Hichens M, Vyas KP. In vivo and in vitro metabolism studies on a class III antiarrhythmic agent. Drug Metab Dispos. 1993 May-Jun;21(3):467-73. PubMed PMID: 8100503.

6: Elliott JM, Selnick HG, Claremon DA, Baldwin JJ, Buhrow SA, Butcher JW, Habecker CN, King SW, Lynch JJ Jr, Phillips BT, et al. 4-Oxospiro[benzopyran-2,4'-piperidines] as class III antiarrhythmic agents. Pharmacological studies on 3,4-dihydro-1'-[2-(benzofurazan-5-yl)- ethyl]-6-methanesulfonamidospiro[(2H)-1-benzopyran-2,4'-piperidin]-4-on e (L-691,121). J Med Chem. 1992 Oct 16;35(21):3973-6. PubMed PMID: 1433205.