159681-91-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 159681-91-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,9,6,8 and 1 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 159681-91:
(8*1)+(7*5)+(6*9)+(5*6)+(4*8)+(3*1)+(2*9)+(1*1)=181
181 % 10 = 1
So 159681-91-1 is a valid CAS Registry Number.