157496-20-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 157496-20-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,7,4,9 and 6 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 157496-20:
(8*1)+(7*5)+(6*7)+(5*4)+(4*9)+(3*6)+(2*2)+(1*0)=163
163 % 10 = 3
So 157496-20-3 is a valid CAS Registry Number.
157496-20-3Relevant academic research and scientific papers
Chiral cyclic amidines
Ten Hoeve,Wynberg
, p. 2215 - 2221 (2007/10/02)
Cyclic amidines are prepared in 3 steps from an aromatic aldehyde, isobutyraldehyde, and urea. The amidines 1 and 2 are readily resolved using chiral cyclic phosphoric acids.
