77445-81-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 77445-81-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,4,4 and 5 respectively; the second part has 2 digits, 8 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 77445-81:
(7*7)+(6*7)+(5*4)+(4*4)+(3*5)+(2*8)+(1*1)=159
159 % 10 = 9
So 77445-81-9 is a valid CAS Registry Number.