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196925-91-4

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196925-91-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 196925-91-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,6,9,2 and 5 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 196925-91:
(8*1)+(7*9)+(6*6)+(5*9)+(4*2)+(3*5)+(2*9)+(1*1)=194
194 % 10 = 4
So 196925-91-4 is a valid CAS Registry Number.

196925-91-4Downstream Products

196925-91-4Relevant articles and documents

123. 7-Deazaguanine DNA: Oligonucleotides with Hydrophobic or Cationic Side Chains

Ramzaeva, Natalya,Mittelbach, Cathrin,Seela, Frank

, p. 1809 - 1822 (1997)

The phosphoramidites 6b and 9 as well as the phosphonate 6a derived from 7-(hex-1-ynyl)- and 7-[5-(trifluoroacetamido)pent-1-ynyl]-substituted 7-deaza-2′-deoxyguanosines 1 and 10, respectively, were prepared (Scheme 1). They were employed in solid-phase oligodeoxynucleotide synthesis of the alternating octamers d(hxy7c7G-C)4 (12), d(C-hxy7c7G)4 (13), and d(npey7c7G-C)4 (15) as well as of other oligonucleotides (see 22-25; Table 2; hxy = hex-1-ynyl, npey = 5-aminopent-1-ynyl). The Tm values and the thermodynamic data of duplex formation were determined and correlated with the major-groove modification of the DNA fragments. A hexynyl side chain introduced into the 7-position of a 7-deazaguanine residue (see 1) was found to fit into the major groove without any protrusion. The incorporation of the (5-aminopent-1-ynyl)-modified 7-deaza-2′-deoxyguanosine 2 into single-stranded oligomers of the type 24 and 25 did not lead to change in duplex stability compared to the parent oligonucleotides. The self-complementary oligomer 15 with alternating npey7c7Gd (2) and dC units did not lead to a cooperative melting, either due to orientational disorder or interaction of the 5-aminopent-1-ynyl moiety with a base or with phosphate residues nearby or on the opposite strand.

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