78423-89-9 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 78423-89-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,8,4,2 and 3 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 78423-89:
(7*7)+(6*8)+(5*4)+(4*2)+(3*3)+(2*8)+(1*9)=159
159 % 10 = 9
So 78423-89-9 is a valid CAS Registry Number.