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643090-88-4

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643090-88-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 643090-88-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,3,0,9 and 0 respectively; the second part has 2 digits, 8 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 643090-88:
(8*6)+(7*4)+(6*3)+(5*0)+(4*9)+(3*0)+(2*8)+(1*8)=154
154 % 10 = 4
So 643090-88-4 is a valid CAS Registry Number.

643090-88-4Relevant articles and documents

Total synthesis of cyclotheonamide C using a tandem backbone-extension- coupling methodology

Roche, Stephane P.,Faure, Sophie,Aitken, David J.

supporting information; experimental part, p. 6840 - 6842 (2009/04/06)

Mastering unusual amino acids: The first total synthesis of the potent protease inhibitor cyclotheonamide C (see structure representation) has been achieved. The key features of the synthesis are a three-component tandem procedure to create a masked α-keto-β-arginine within a peptide chain, and the control of the extended conjugation of a vinylogous α,β-dehydrotyrosine. (Chemical Equation Presented)

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