21398-12-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 21398-12-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,3,9 and 8 respectively; the second part has 2 digits, 1 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 21398-12:
(7*2)+(6*1)+(5*3)+(4*9)+(3*8)+(2*1)+(1*2)=99
99 % 10 = 9
So 21398-12-9 is a valid CAS Registry Number.