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5249-68-3

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5249-68-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 5249-68-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 5,2,4 and 9 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 5249-68:
(6*5)+(5*2)+(4*4)+(3*9)+(2*6)+(1*8)=103
103 % 10 = 3
So 5249-68-3 is a valid CAS Registry Number.

5249-68-3Relevant articles and documents

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Katsoyannis,P.G. et al.

, p. 164 - 166 (1966)

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Synthesis of peptides employing protected-amino acid halides mediated by commercial anion exchange resin

Bhaskara Redddy,Kumari, Y. Bharathi,Ananda, Kuppanna

, p. 225 - 229 (2013/12/04)

Coupling of protected-amino acid halides (chloride, fluoride) mediated by commercial anion exchange resin for the solution phase synthesis of peptides is described. The reaction was carried out in an organic medium, circumventing the use of an organic base or an inorganic base. The coupling is fast, clean and racemization free. The anion exchange resin functions as a solid-phase basic scavenger, soaking up the HCl produced and allowing the amine to react. The method is extended for the coupling of sterically hindered α,α,- dialkylamino acids. Graphical Abstract: [Figure not available: see fulltext.]

NATURAL PEPTIDES AND THEIR ANALOGS XXV. SYNTHESIS OF PARTIALLY PROTECTED PEPTIDES CORRESPONDING TO THE B9-14 AND B15-20 FRAGMENTS OF HUMAN INSULIN

Kolomeitseva, L. A.,Kocharova, N. A.,Ibragimova, L. D.,Krivtsov, V. F.,Shvachkin, Yu. P.

, p. 372 - 377 (2007/10/02)

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