221639-66-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 221639-66-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,1,6,3 and 9 respectively; the second part has 2 digits, 6 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 221639-66:
(8*2)+(7*2)+(6*1)+(5*6)+(4*3)+(3*9)+(2*6)+(1*6)=123
123 % 10 = 3
So 221639-66-3 is a valid CAS Registry Number.