21198-17-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21198-17-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,1,9 and 8 respectively; the second part has 2 digits, 1 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 21198-17:
(7*2)+(6*1)+(5*1)+(4*9)+(3*8)+(2*1)+(1*7)=94
94 % 10 = 4
So 21198-17-4 is a valid CAS Registry Number.