77642-80-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 77642-80-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,6,4 and 2 respectively; the second part has 2 digits, 8 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 77642-80:
(7*7)+(6*7)+(5*6)+(4*4)+(3*2)+(2*8)+(1*0)=159
159 % 10 = 9
So 77642-80-9 is a valid CAS Registry Number.