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99519-16-1

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99519-16-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 99519-16-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,5,1 and 9 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 99519-16:
(7*9)+(6*9)+(5*5)+(4*1)+(3*9)+(2*1)+(1*6)=181
181 % 10 = 1
So 99519-16-1 is a valid CAS Registry Number.

99519-16-1Relevant articles and documents

Chemical synthesis of a pentaribonucleoside tetraphosphate constituting the 3'-acceptor stem sequence of E. coli tRNAIle using 2'-O-(3-methoxy-1,5-dicarbomethoxypentan-3-yl)-ribonucleoside building blocks. Application of a new achiral and acid-labile 2'-hydroxyl protecting group in tRNA synthesis.

Sandstr?m,Kwiatkowski,Chattopadhyaya

, p. 273 - 290 (2007/10/02)

A synthesis of a pentaribonucleotide fragment constituting the residues 59-63 of 3'-terminus of E. coli tRNAIle, 5'-ApGpUpCpC-3', has been carried out using a new, easily accessible and achiral 2'-ketal protecting group. The new 2'-ketal group has an additional advantage in that it is easily functionalized to the diamide with aqueous ammonia in the penultimate step of deblocking of fully protected oligoribonucleotides. Such a functionalization of the 2'-ketal group at the penultimate step of deblocking of the fully protected tRNA molecule enhances its relative rate of removal under an acidic condition with a minimum of damage of the target tRNA molecule.

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