309731-56-4 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 309731-56-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,0,9,7,3 and 1 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 309731-56:
(8*3)+(7*0)+(6*9)+(5*7)+(4*3)+(3*1)+(2*5)+(1*6)=144
144 % 10 = 4
So 309731-56-4 is a valid CAS Registry Number.