91561-16-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 91561-16-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,5,6 and 1 respectively; the second part has 2 digits, 1 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 91561-16:
(7*9)+(6*1)+(5*5)+(4*6)+(3*1)+(2*1)+(1*6)=129
129 % 10 = 9
So 91561-16-9 is a valid CAS Registry Number.