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21038-25-5

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21038-25-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21038-25-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,0,3 and 8 respectively; the second part has 2 digits, 2 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 21038-25:
(7*2)+(6*1)+(5*0)+(4*3)+(3*8)+(2*2)+(1*5)=65
65 % 10 = 5
So 21038-25-5 is a valid CAS Registry Number.

21038-25-5Relevant articles and documents

A solid-phase approach to DDB derivatives

Qi, Xiuxiang,Wang, Xiaolai,Wang, Limin,Wang, Qiang,Cheng, Senxiang,Suo, Jishuan,Chang, Junbiao

, p. 805 - 810 (2007/10/03)

Since the discovery of 2,2′-dimethoxycarbonyl-4,4-dimethoxy-5,6, 5′,6′-biomethylenedioxy-biphenyl (DDB) as a potent anti-HBV agent, we have studied the structure-activity relationships of 4,4′-dimethoxy-5, 6,5′,6′-dimethenedioxy-2-alkyloxycarbonyl-2′-(4-substituted benzyl piperazin-1-yl)carbonyl-biphenyl as anti-HBV agents. Therefore, it is rational to extend this study to the 3,3′-disustituted-4,4′- dimethoxy-5,6,5′,6′-dimethenedioxy-2-alkyloxycarbonyl-2′- Serine derivatives. Thus, in an attempt to develop an efficient method for the preparation of a large number of DDB derivatives, the reaction between a DDB acid chloride and serine derivatives on solid support was studied. The structure of resulted compounds was confirmed by LC-MS and 1H NMR analysis. Compounds 2a, 2d, 2f, 2j showed in vitro anti-HBV activity without significant toxicity up to 100 μM.

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