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136749-45-6

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136749-45-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 136749-45-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,6,7,4 and 9 respectively; the second part has 2 digits, 4 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 136749-45:
(8*1)+(7*3)+(6*6)+(5*7)+(4*4)+(3*9)+(2*4)+(1*5)=156
156 % 10 = 6
So 136749-45-6 is a valid CAS Registry Number.

136749-45-6Relevant articles and documents

First total syntheses of oresbiusins A and B, their antipodes, and racemates: Configuration revision and anti-HIV activity

Hwu, Jih Ru,Varadaraju, Tirumala G.,Abd-Elazem, Ibrahim S.,Huang, Ru Chih C.

supporting information; experimental part, p. 4684 - 4688 (2012/09/22)

The first total syntheses of oresbiusin A in the (+)-, (-)-, and (±)-forms were accomplished in five steps with overall yields of ca. 70 %. The key intermediates with optical activity were generated through a Sharpless asymmetric dihydroxylation reaction. These efforts allowed us to establish the absolute configuration of this natural product with dextrorotary and a 2S configuration. In addition, the total syntheses of both enantiomers of oresbiusin B along with its racemate were accomplished in six steps with overall yields of 58 %. Among these compounds, the unnatural oresbiusin A with a levorotary rotation was found to possess dose dependent anti-HIV-1 activity in H9 cells, whereas the other compounds were inactive. Copyright

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