The CAS Registry Mumber 114439-68-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,4,4,3 and 9 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 114439-68: (8*1)+(7*1)+(6*4)+(5*4)+(4*3)+(3*9)+(2*6)+(1*8)=118 118 % 10 = 8 So 114439-68-8 is a valid CAS Registry Number.