71818-80-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 71818-80-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,8,1 and 8 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 71818-80:
(7*7)+(6*1)+(5*8)+(4*1)+(3*8)+(2*8)+(1*0)=139
139 % 10 = 9
So 71818-80-9 is a valid CAS Registry Number.