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664333-54-4

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664333-54-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 664333-54-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,6,4,3,3 and 3 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 664333-54:
(8*6)+(7*6)+(6*4)+(5*3)+(4*3)+(3*3)+(2*5)+(1*4)=164
164 % 10 = 4
So 664333-54-4 is a valid CAS Registry Number.

664333-54-4Downstream Products

664333-54-4Relevant articles and documents

2′-Spiro ribo- and arabinonucleosides: Synthesis, molecular modelling and incorporation into oligodeoxynucleotides

Ravindra Babu,Keinicke, Lise,Petersen, Michael,Nielsen, Claus,Wengel, Jesper

, p. 3514 - 3526 (2007/10/03)

We have synthesized four conformationally restricted bicyclic 2′-spiro nucleosides via 2′-C-allyl nucleosides as key intermediates. The ribo-configured 2′-spironucleosides 9b and 14b were obtained by a convergent strategy starting from 2-ketofuranose 1 whereas the arabino-configured 2′-spironucleosides 21 and 27 were obtained by a linear strategy with a 2′-ketouridine derivative as starting material. The furanose ring of 9b/14b adopts N-type conformations whereas the furanose ring of 21/27 exists as an N?S equilibrium. These compounds snowed no anti-HIV-1 activity or cytotoxicity. Incorporation of the four 2′-spironucleosides (as monomers X4 and X5) into oligodeoxynucleotides was accomplished using the phosphoramidite approach on an automated DNA synthesizer. Irrespective of monomeric configuration, hybridization studies revealed that these 2′-spironucleotide monomers (X4 and X5) induce decreased duplex thermostabilities compared with the corresponding DNA:DNA and DNA:RNA duplexes. Molecular modelling indicated that steric constraints are a possible reason for the lowered binding affinities of the modified oligodeoxynucleotides towards complementary single-stranded DNA and single-stranded RNA complements.

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