77711-21-8 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 77711-21-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,7,1 and 1 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 77711-21:
(7*7)+(6*7)+(5*7)+(4*1)+(3*1)+(2*2)+(1*1)=138
138 % 10 = 8
So 77711-21-8 is a valid CAS Registry Number.