21972-28-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21972-28-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,9,7 and 2 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 21972-28:
(7*2)+(6*1)+(5*9)+(4*7)+(3*2)+(2*2)+(1*8)=111
111 % 10 = 1
So 21972-28-1 is a valid CAS Registry Number.