256643-65-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 256643-65-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,6,6,4 and 3 respectively; the second part has 2 digits, 6 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 256643-65:
(8*2)+(7*5)+(6*6)+(5*6)+(4*4)+(3*3)+(2*6)+(1*5)=159
159 % 10 = 9
So 256643-65-9 is a valid CAS Registry Number.