642979-77-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 642979-77-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,4,2,9,7 and 9 respectively; the second part has 2 digits, 7 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 642979-77:
(8*6)+(7*4)+(6*2)+(5*9)+(4*7)+(3*9)+(2*7)+(1*7)=209
209 % 10 = 9
So 642979-77-9 is a valid CAS Registry Number.