643090-89-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 643090-89-5 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 9 respectively.
Calculate Digit Verification of CAS Registry Number 643090-89:
(8*6)+(7*4)+(6*3)+(5*0)+(4*9)+(3*0)+(2*8)+(1*9)=155
155 % 10 = 5
So 643090-89-5 is a valid CAS Registry Number.
643090-89-5Relevant articles and documents
Synthetic approaches to the southern part of cyclotheonamide C
Aitken, David J.,Faure, Sophie,Roche, Stéphane
, p. 8827 - 8830 (2007/10/03)
A synthetic equivalent of the southern segment of cyclotheonamide C, a cyclopentapeptide isolated from the sponge Theonella, has been synthesized via complementary Wadsworth-Emmons or palladium-catalysed methodologies followed by tandem oxidation/vinyloga
