The CAS Registry Mumber 133414-06-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,4,1 and 4 respectively; the second part has 2 digits, 0 and 6 respectively. Calculate Digit Verification of CAS Registry Number 133414-06: (8*1)+(7*3)+(6*3)+(5*4)+(4*1)+(3*4)+(2*0)+(1*6)=89 89 % 10 = 9 So 133414-06-9 is a valid CAS Registry Number.