81559-55-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81559-55-9 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 9 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 81559-55:
(7*8)+(6*1)+(5*5)+(4*5)+(3*9)+(2*5)+(1*5)=149
149 % 10 = 9
So 81559-55-9 is a valid CAS Registry Number.