7669-21-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 7669-21-8 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,6,6 and 9 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 7669-21:
(6*7)+(5*6)+(4*6)+(3*9)+(2*2)+(1*1)=128
128 % 10 = 8
So 7669-21-8 is a valid CAS Registry Number.
7669-21-8Relevant articles and documents
The Reaction of Thiourea Derivatives with Maleic Acid Anhydride
Zawisza, Tadeusz,Wagner, Edwin
, p. 149 - 158 (2007/10/02)
The reaction of thiourea derivatives with maleic and bromomaleic acid anhydride is described, the chemical structure of the compound obtained is proved; some biologically active acids yield amide derivatives 24-32.Amides of the 1,3-thiazine-6-carboxylic a
