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188978-68-9

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188978-68-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 188978-68-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,8,9,7 and 8 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 188978-68:
(8*1)+(7*8)+(6*8)+(5*9)+(4*7)+(3*8)+(2*6)+(1*8)=229
229 % 10 = 9
So 188978-68-9 is a valid CAS Registry Number.

188978-68-9Relevant academic research and scientific papers

Cyclic HIV protease inhibitors: Design and synthesis of orally bioavailable, pyrazole P2/P2' cyclic ureas with improved potency

Han, Qi,Chang, Chong-Hwan,Li, Renhua,Ru, Yu,Jadhav, Prabhakar K.,Lam, Patrick Y. S.

, p. 2019 - 2028 (2007/10/03)

Highly potent HIV-1 protease (HIVPR) inhibitors have been designed and synthesized by introducing bidentate hydrogen-bonding oxime and pyrazole groups at the meta-position of the phenyl ring on the P2/P2' substituents of cyclic ureas. Nonsymmetrical cyclic ureas incorporating 3(1H)-pyrazolylbenzyl as P2 and hydrophilic functionalities as P2' show potent protease inhibition and antiviral activities against HIV and have good oral bioavailabilities. The X-ray structure of HIVPR-10A complex confirms that the two pyrazole rings of 10A form bidentate hydrogen bonds with the side-chain oxygen (C=O) and backbone nitrogen (N-H) of Asp30/30' of HIVPR.

Cyclic HIV protease inhibitors: Synthesis, conformational analysis, P2/P2' structure-activity relationship, and molecular recognition of cyclic ureas

Lam, Patrick Y. S.,Ru, Yu,Jadhav, Prabhakar K.,Aldrich, Paul E.,DeLucca, George V.,Eyermann, Charles J.,Chang, Chong-Hwan,Emmett, George,Holler, Edward R.,Daneker, Wayne F.,Li, Liangzhu,Confalone, Pat N.,McHugh, Robert J.,Han, Qi,Li, Renhua,Markwalder, Jay A.,Seitz, Steven P.,Sharpe, Thomas R.,Bacheler, Lee T.,Rayner, Marlene M.,Klabe, Ronald M.,Shum, Linyee,Winslow, Dean L.,Kornhauser, David M.,Jackson, David A.,Erickson-Viitanen, Susan,Hodge, C. Nicholas

, p. 3514 - 3525 (2007/10/03)

High-resolution X-ray structures of the complexes of HIV-1 protease (HIV-1PR) with peptidomimetic inhibitors reveal the presence of a structural water molecule which is hydrogen bonded to both the mobile flaps of the enzyme and the two carbonyls flanking

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