The CAS Registry Mumber 120162-75-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,0,1,6 and 2 respectively; the second part has 2 digits, 7 and 5 respectively. Calculate Digit Verification of CAS Registry Number 120162-75: (8*1)+(7*2)+(6*0)+(5*1)+(4*6)+(3*2)+(2*7)+(1*5)=76 76 % 10 = 6 So 120162-75-6 is a valid CAS Registry Number.