109806-81-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 109806-81-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,9,8,0 and 6 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 109806-81:
(8*1)+(7*0)+(6*9)+(5*8)+(4*0)+(3*6)+(2*8)+(1*1)=137
137 % 10 = 7
So 109806-81-7 is a valid CAS Registry Number.