The CAS Registry Mumber 120014-72-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,0,0,1 and 4 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 120014-72: (8*1)+(7*2)+(6*0)+(5*0)+(4*1)+(3*4)+(2*7)+(1*2)=54 54 % 10 = 4 So 120014-72-4 is a valid CAS Registry Number.