The CAS Registry Mumber 79712-14-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,9,7,1 and 2 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 79712-14: (7*7)+(6*9)+(5*7)+(4*1)+(3*2)+(2*1)+(1*4)=154 154 % 10 = 4 So 79712-14-4 is a valid CAS Registry Number.