The CAS Registry Mumber 2479-59-6 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,4,7 and 9 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 2479-59: (6*2)+(5*4)+(4*7)+(3*9)+(2*5)+(1*9)=106 106 % 10 = 6 So 2479-59-6 is a valid CAS Registry Number.