81531-47-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81531-47-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,5,3 and 1 respectively; the second part has 2 digits, 4 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 81531-47:
(7*8)+(6*1)+(5*5)+(4*3)+(3*1)+(2*4)+(1*7)=117
117 % 10 = 7
So 81531-47-7 is a valid CAS Registry Number.
81531-47-7Relevant articles and documents
Improved Synthetic Pathways to the Cyclol System of Ergot Peptide Alkaloids
Losse, Guenter,Strobel, Juergen
, p. 765 - 778 (2007/10/02)
As demonstrated in the case of N-tert.butyloxycarbonylhydroxyglycine, N-protected 2-hydroxy-2-amino acids can be directly condensed with dipeptide esters to afford tripeptide derivatives, which are activated C-terminally and transferred into the epimers (