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157543-67-4

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157543-67-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 157543-67-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,5,4 and 3 respectively; the second part has 2 digits, 6 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 157543-67:
(8*1)+(7*5)+(6*7)+(5*5)+(4*4)+(3*3)+(2*6)+(1*7)=154
154 % 10 = 4
So 157543-67-4 is a valid CAS Registry Number.

157543-67-4Relevant articles and documents

Fast Cleavage and Deprotection of Oligonucleotides

Reddy, M. P.,Hanna, N. B.,Farooqui, Firdous

, p. 4311 - 4314 (1994)

We have developed methylamine/ammonia as a fast cleavage and deprotection reagent which effects complete cleavage of oligonucleotides from the solid support in 5 min at room temperature and complete deprotection in 5 min at 65 deg C.The problem of transamination side products formation, faced with the commonly used dCbz (10percent side product) upon treatment with methylamine/ammonia, has been sucessfully solved by the use of dCac (0.0percent side product).DMT dCac phosphoramidite-methylamine/ammonia system furnished oligonucleotides in equal or superior quality as compared to the other systems.

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