The CAS Registry Mumber 93968-94-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,3,9,6 and 8 respectively; the second part has 2 digits, 9 and 4 respectively. Calculate Digit Verification of CAS Registry Number 93968-94: (7*9)+(6*3)+(5*9)+(4*6)+(3*8)+(2*9)+(1*4)=196 196 % 10 = 6 So 93968-94-6 is a valid CAS Registry Number.