The CAS Registry Mumber 149146-26-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,9,1,4 and 6 respectively; the second part has 2 digits, 2 and 6 respectively. Calculate Digit Verification of CAS Registry Number 149146-26: (8*1)+(7*4)+(6*9)+(5*1)+(4*4)+(3*6)+(2*2)+(1*6)=139 139 % 10 = 9 So 149146-26-9 is a valid CAS Registry Number.