128721-90-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 128721-90-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,7,2 and 1 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 128721-90:
(8*1)+(7*2)+(6*8)+(5*7)+(4*2)+(3*1)+(2*9)+(1*0)=134
134 % 10 = 4
So 128721-90-4 is a valid CAS Registry Number.
128721-90-4Relevant articles and documents
An improved method for the synthesis of sulfonylureas
Cervello,Sastre
, p. 221 - 222 (1990)
Treatment of isocyanates with sulfonamides in dimethylformamide in the presence of copper(I) chloride affords sulfonylureas in high yields under mild conditions.