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145986-21-6

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145986-21-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 145986-21-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,5,9,8 and 6 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 145986-21:
(8*1)+(7*4)+(6*5)+(5*9)+(4*8)+(3*6)+(2*2)+(1*1)=166
166 % 10 = 6
So 145986-21-6 is a valid CAS Registry Number.

145986-21-6Relevant articles and documents

Asymmetric Synthesis and Biological Evaluation of β-L-(2R,5S)- and α-L-(2R,5R)-1,3-Oxathiolane-Pyrimidine and -Purine Nucleosides as Potential Anti-HIV Agents

Jeong, Lak S.,Shinazi, Raymond F.,Beach, J. Warren,Kim, Hea O.,Nampalli, Satyanarayana,et al.

, p. 181 - 195 (2007/10/02)

In order to study the structure-acivity relationships of L-oxathiolanyl nucleosides as potential anti-HIV agents, a series of enantiomerically pure L-oxathiolanyl pyrimidine and purine nucleosides were synthesized and evaluated for anti-HIV-1 activity in human peripheral blood mononuclear (PBM) cells.The key intermediate 8 was synthesized starting from L-gulose via 1,6-thiaanhydro-L-gulopyranose.The acetate 8 was condensed with thymine, 5-substituted uracils and cytosines, 6-chloropurine, and 6-chloro-2-fluoropurine to give pyrimidine and purine nucleosides.Upon evaluation of these final nucleosides, the 5-fluorocytosine derivative 51 was found to be the most potent compound among those tested.In the case of 5-substituted cytosine analogues, the antiviral potency was found to be in the following decreasing order: cytosine (β-isomer) > 5-iodocytosine (β-isomer) > 5-fluorocytosine (α-isomer) > 5-methylcytosine (α-isomer) > 5-methylcytosine (β-isomer) > 5-bromocytosine (β-isomer) > 5-chlorocytosine (β-isomer).Among the thymine, uracil, and 5-substituted uracil derivatives, thymine (α-isomer) and uracil (β-isomer) derivatives exhibited moderate anti-HIV activity.In the purine series, the antiviral potency is found to be in the following decreasing order: adenine (β-isomer) > 6-chloropurine (β-isomer) > 6-chloropurine (α-isomer) > 2-NH2-6-Cl-purine (β-isomer) > guanine (β-isomer) > N6-methyladenine (α-isomer) > N6-methyladenine (β-isomer).The cytotoxicity was also determined in human PBM cells as well as Vero cells.None of the synthesized nucleosides was toxic up to 100 μ in PBM cells.

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