21166-16-5 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21166-16-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,1,6 and 6 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 21166-16:
(7*2)+(6*1)+(5*1)+(4*6)+(3*6)+(2*1)+(1*6)=75
75 % 10 = 5
So 21166-16-5 is a valid CAS Registry Number.