99889-21-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 99889-21-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,8,8 and 9 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 99889-21:
(7*9)+(6*9)+(5*8)+(4*8)+(3*9)+(2*2)+(1*1)=221
221 % 10 = 1
So 99889-21-1 is a valid CAS Registry Number.