259809-21-7 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 259809-21-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,9,8,0 and 9 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 259809-21:
(8*2)+(7*5)+(6*9)+(5*8)+(4*0)+(3*9)+(2*2)+(1*1)=177
177 % 10 = 7
So 259809-21-7 is a valid CAS Registry Number.