DA 4643

    WARNING: This product is for research use only, not for human or veterinary use.

MedKoo CAT#: 581136

CAS#: 95833-19-5

Description: DA 4643 is one of histamine H2-receptor antagonistic. Two histamine H2-receptor antagonists of the phenylformamidine type, mifentidine (N-isopropyl-N'-(4-1H-imidazol-4-yl-phenyl) formamidine dihydrochloride; I) and DA 4643 (N-methyl-N'-(3-(2-guanidinothiazol-4-yl)-phenyl) formamidine dihydrochloride; II), have been investigated by experimental physico-chemical studies and theoretical conformational analysis. Both mifentidine and DA 4643 interact with the histamine H2-receptor at the same site, utilizing in the binding process the same, or closely similar, receptor structural features.

Chemical Structure

DA 4643
CAS# 95833-19-5

Theoretical Analysis

MedKoo Cat#: 581136
Name: DA 4643
CAS#: 95833-19-5
Chemical Formula: C12H14N6S
Exact Mass: 274.1001
Molecular Weight: 274.35
Elemental Analysis: C, 52.54; H, 5.14; N, 30.63; S, 11.69

Price and Availability

This product is not in stock, which may be available by custom synthesis. For cost-effective reason, minimum order is 1g (price is usually high, lead time is 2~3 months, depending on the technical challenge). Quote less than 1g will not be provided. To request quote, please email to sales @medkoo.com or click below button.
Note: Price will be listed if it is available in the future.

Request quote for custom synthesis

Synonym: DA 4643; DA-4643; DA4643;

IUPAC/Chemical Name: N-Methyl-N'-(3-(2-guanidinothiazol-4-yl)phenyl)formamidine


InChi Code: InChI=1S/C12H14N6S/c1-15-7-16-9-4-2-3-8(5-9)10-6-19-12(17-10)18-11(13)14/h2-7H,1H3,(H,15,16)(H4,13,14,17,18)


Appearance: Solid powder

Purity: >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).

Solubility: 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: 2934.99.9001

Preparing Stock Solutions

The following data is based on the product molecular weight 274.35 Batch specific molecular weights may vary from batch to batch due to the degree of hydration, which will affect the solvent volumes required to prepare stock solutions.

Recalculate based on batch purity %
Concentration / Solvent Volume / Mass 1 mg 5 mg 10 mg
1 mM 1.15 mL 5.76 mL 11.51 mL
5 mM 0.23 mL 1.15 mL 2.3 mL
10 mM 0.12 mL 0.58 mL 1.15 mL
50 mM 0.02 mL 0.12 mL 0.23 mL

Molarity Calculator

Calculate the mass, volume, or concentration required for a solution.

*When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and SDS / CoA (available online).

Reconstitution Calculator

The reconstitution calculator allows you to quickly calculate the volume of a reagent to reconstitute your vial. Simply enter the mass of reagent and the target concentration and the calculator will determine the rest.


Dilution Calculator

Calculate the dilution required to prepare a stock solution.

1: Donetti A, Trummlitz G, Bietti G, Cereda E, Bazzano C, Wagner HU. Conformational studies of two histamine H2-receptor antagonistic phenylformamidines: mifentidine and its guanidinothiazole analogue DA 4643. Arzneimittelforschung. 1985;35(1A):306-15. PubMed PMID: 2859031.

2: Paquay JB, Bolscher MT, Voss HP, Timmerman H, Bast A. Difference in the inhibition of nitric oxide synthase and cytochrome P-450 by some H(2)-antagonists. Toxicol In Vitro. 1997 Dec;11(6):775-8. PubMed PMID: 20654383.