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276888-31-4

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276888-31-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 276888-31-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,7,6,8,8 and 8 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 276888-31:
(8*2)+(7*7)+(6*6)+(5*8)+(4*8)+(3*8)+(2*3)+(1*1)=204
204 % 10 = 4
So 276888-31-4 is a valid CAS Registry Number.

276888-31-4Relevant articles and documents

Concise total synthesis of the prolyl endopeptidase inhibitor eurystatin A via a novel Passerini reaction-deprotection-acyl migration strategy

Owens, Timothy D,Araldi, Gian-Luca,Nutt, Ruth F,Semple

, p. 6271 - 6274 (2007/10/03)

The Passerini reaction between suitably protected alaninal, leucine isonitrile, and ornithine components delivered adducts 10a,b in high yield. Orthogonal N-deprotection of 10a led, via a smooth O- to N-acyl migration, to 11, which constitutes the entire skeleton of the eurystatins. Subsequent deprotection, macrocyclization, elaboration, and final oxidation steps efficiently afforded eurystatin A 1a in high overall yield.

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