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175692-25-8

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175692-25-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 175692-25-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,7,5,6,9 and 2 respectively; the second part has 2 digits, 2 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 175692-25:
(8*1)+(7*7)+(6*5)+(5*6)+(4*9)+(3*2)+(2*2)+(1*5)=168
168 % 10 = 8
So 175692-25-8 is a valid CAS Registry Number.

175692-25-8Downstream Products

175692-25-8Relevant articles and documents

Synthesis and pharmacology of combined histamine H1-/H2-receptor antagonists containing diphenhydramine and cyproheptadine derivatives

Wolf, Cornelia,Schunack, Walter

, p. 87 - 94 (2007/10/02)

The classical histamine H1-receptor antagonists diphenhydramine (3a) and cyproheptadine (9) and their derivatives (3b-d, 10) were connected with a 2-guanidinothiazole containing structure (28) derived from the H2-receptor antagonist tiotidine in order to obtain combined H1/H2-receptor antagonists. The two moieties were not directly linked together, but were separated by a polymethylene spacer and a polar group (nitroethenediamine or urea). Thus 12 compounds were obtained that proved in vitro to possess high H1- and H2-receptor antagonist activity at the isolated guinea-pig ileum (H1) and the isolated guinea-pig right atrium (H2), respectively. The incorporation of the diphenhydramine as well as the cyproheptadine component provides high affinity to H1-receptors. The tricyclic cyproheptadine and its 10,11-dihydro derivative (30-32, 34), however, cause a decrease of H2-receptor antagonist potency compared to the diphenhydramines (29a-d, 33a-d). Using nitroethenediamine as the polar group is apparently more favourable to H1- and H2-receptor affinity as the urea function. All compounds elicit a dual mode of competitive and noncompetitive antagonism. Among the novel compounds the nitroethenediamines with 4-fluoro- or 4-methyl-substituted diphenhydramine as H1-receptor antagonist moiety (29c, d) display the most potent H1- and H2-receptor antagonist effects. The presented concept is a very promising way to combine H1- and H2-receptor antagonist properties in one molecule.

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