The CAS Registry Mumber 79314-93-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,3,1 and 4 respectively; the second part has 2 digits, 9 and 3 respectively. Calculate Digit Verification of CAS Registry Number 79314-93: (7*7)+(6*9)+(5*3)+(4*1)+(3*4)+(2*9)+(1*3)=155 155 % 10 = 5 So 79314-93-5 is a valid CAS Registry Number.