81557-54-2 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81557-54-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,5,5 and 7 respectively; the second part has 2 digits, 5 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 81557-54:
(7*8)+(6*1)+(5*5)+(4*5)+(3*7)+(2*5)+(1*4)=142
142 % 10 = 2
So 81557-54-2 is a valid CAS Registry Number.