128836-21-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 128836-21-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,8,3 and 6 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 128836-21:
(8*1)+(7*2)+(6*8)+(5*8)+(4*3)+(3*6)+(2*2)+(1*1)=145
145 % 10 = 5
So 128836-21-5 is a valid CAS Registry Number.
128836-21-5Relevant articles and documents
Total synthesis of (-)-nummularine F
Heffner, Robert J.,Jiang, Jianjun,Joullié, Madeleine M.
, p. 10181 - 10189 (2007/10/02)
The first total synthesis of the 14-membered para ansa cyclopeptide alkaloid (-)-nummularine F is reported. The pivotal transformations of the synthetic strategy are (1) a stereocontrolled approach for introducing the absolute stereochemistry at the α- an