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162553-97-1

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162553-97-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 162553-97-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,2,5,5 and 3 respectively; the second part has 2 digits, 9 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 162553-97:
(8*1)+(7*6)+(6*2)+(5*5)+(4*5)+(3*3)+(2*9)+(1*7)=141
141 % 10 = 1
So 162553-97-1 is a valid CAS Registry Number.

162553-97-1Relevant articles and documents

Synthesis of the Peptide Fragment of Pseudobactin

Okonya, John F.,Kolasa, Teodozyj,Miller, Marvin J.

, p. 1932 - 1935 (2007/10/02)

Synthesis of the peptide fragment, L-Lys-D-threo-β-OH-Asp-L-Ala-D-allo-Thr-L-Ala-N-OH-D-cOrn, of pseudobactin (2) is reported.By utilizing 2-ethoxy-1-(ethoxycarbonyl)-1,2-dihydroquinoline (EEDQ) as a coupling reagent, peptide bonds were constructed without requiring protection of hydroxyl groups.To access the D-allo-Thr residue in the peptide fragment of pseudobactin, the Thr residue in N-Cbz-L-Ala-D-Thr-L-Ala-O-t-Bu (4b) was converted to a peptidyl oxazoline using Burgess' reagent.Hydrolysis of the oxazoline with 1 N HCl followed by base-catalyzed acyl migration then provided the D-allo-Thr analog 4a.

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