21521-01-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21521-01-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,5,2 and 1 respectively; the second part has 2 digits, 0 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 21521-01:
(7*2)+(6*1)+(5*5)+(4*2)+(3*1)+(2*0)+(1*1)=57
57 % 10 = 7
So 21521-01-7 is a valid CAS Registry Number.