91971-56-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 91971-56-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,9,7 and 1 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 91971-56:
(7*9)+(6*1)+(5*9)+(4*7)+(3*1)+(2*5)+(1*6)=161
161 % 10 = 1
So 91971-56-1 is a valid CAS Registry Number.