642981-89-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 642981-89-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,2,9,8 and 1 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 642981-89:
(8*6)+(7*4)+(6*2)+(5*9)+(4*8)+(3*1)+(2*8)+(1*9)=193
193 % 10 = 3
So 642981-89-3 is a valid CAS Registry Number.