The CAS Registry Mumber 122093-62-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,2,0,9 and 3 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 122093-62: (8*1)+(7*2)+(6*2)+(5*0)+(4*9)+(3*3)+(2*6)+(1*2)=93 93 % 10 = 3 So 122093-62-3 is a valid CAS Registry Number.