91668-21-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 91668-21-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,6,6 and 8 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 91668-21:
(7*9)+(6*1)+(5*6)+(4*6)+(3*8)+(2*2)+(1*1)=152
152 % 10 = 2
So 91668-21-2 is a valid CAS Registry Number.