The CAS Registry Mumber 533928-94-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 5,3,3,9,2 and 8 respectively; the second part has 2 digits, 9 and 4 respectively. Calculate Digit Verification of CAS Registry Number 533928-94: (8*5)+(7*3)+(6*3)+(5*9)+(4*2)+(3*8)+(2*9)+(1*4)=178 178 % 10 = 8 So 533928-94-8 is a valid CAS Registry Number.