217491-21-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 217491-21-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,7,4,9 and 1 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 217491-21:
(8*2)+(7*1)+(6*7)+(5*4)+(4*9)+(3*1)+(2*2)+(1*1)=129
129 % 10 = 9
So 217491-21-9 is a valid CAS Registry Number.