389-21-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 389-21-9 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 3,8 and 9 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 389-21:
(5*3)+(4*8)+(3*9)+(2*2)+(1*1)=79
79 % 10 = 9
So 389-21-9 is a valid CAS Registry Number.