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566939-06-8

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566939-06-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 566939-06-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,6,6,9,3 and 9 respectively; the second part has 2 digits, 0 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 566939-06:
(8*5)+(7*6)+(6*6)+(5*9)+(4*3)+(3*9)+(2*0)+(1*6)=208
208 % 10 = 8
So 566939-06-8 is a valid CAS Registry Number.

566939-06-8Downstream Products

566939-06-8Relevant articles and documents

New water-soluble prodrugs of HIV protease inhibitors based on O→N intramolecular acyl migration

Hamada, Yoshio,Ohtake, Jun,Sohma, Youhei,Kimura, Tooru,Hayashi, Yoshio,Kiso, Yoshiaki

, p. 4155 - 4167 (2002)

To improve the low water-solubility of HIV protease inhibitors, we synthesized water-soluble prodrugs of KNI-272 and KNI-279 which are potent HIV-1 protease inhibitors consisting of an Apns-Thz core structure (Apns; allophenylnorstatine, Thz; thiazolidine-4-carboxylic acid) as an inhibitory machinery. The prodrugs, which contained an O-acyl peptidomimetic structure with an ionized amino group leading to the increase of water-solubility, were designed to regenerate the corresponding parent drugs based on the O→N intramolecular acyl migration reaction at the α-hydroxy-β-amino acid residue, that is allophenylnorstatine. The synthetic prodrugs 3, 4, 6, and 7 improved the water-solubility (>300 mg/mL) more than 4000-fold in comparison with the parent compounds, which is the practically acceptable value as water-soluble drugs. These prodrugs were stable as an HCl salt and in a strongly acidic solution corresponding to gastric juice (pH 2.0), and could be converted to the parent compounds promptly in the aqueous condition from slightly acidic to basic pH at 37°C, with the suitable migration rate, via a five-membered ring intermediate. Using a similar method, we synthesized a prodrug (12) of ritonavir, a clinically useful HIV-1 protease inhibitor as an anti-AIDS drug. In contrast to the prodrugs 3, 4, 6, and 7, the prodrug 12 was very slowly converted to ritonavir probably through a six-membered ring intermediate, with the t1/2 value of 32 h that may not be suitable for practical use.

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