71681-69-1 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 71681-69-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,1,6,8 and 1 respectively; the second part has 2 digits, 6 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 71681-69:
(7*7)+(6*1)+(5*6)+(4*8)+(3*1)+(2*6)+(1*9)=141
141 % 10 = 1
So 71681-69-1 is a valid CAS Registry Number.