91557-23-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 91557-23-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,1,5,5 and 7 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 91557-23:
(7*9)+(6*1)+(5*5)+(4*5)+(3*7)+(2*2)+(1*3)=142
142 % 10 = 2
So 91557-23-2 is a valid CAS Registry Number.