109643-21-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 109643-21-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,6,4 and 3 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 109643-21:
(8*1)+(7*0)+(6*9)+(5*6)+(4*4)+(3*3)+(2*2)+(1*1)=122
122 % 10 = 2
So 109643-21-2 is a valid CAS Registry Number.