The CAS Registry Mumber 112471-52-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,2,4,7 and 1 respectively; the second part has 2 digits, 5 and 2 respectively. Calculate Digit Verification of CAS Registry Number 112471-52: (8*1)+(7*1)+(6*2)+(5*4)+(4*7)+(3*1)+(2*5)+(1*2)=90 90 % 10 = 0 So 112471-52-0 is a valid CAS Registry Number.