The CAS Registry Mumber 90126-08-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,1,2 and 6 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 90126-08: (7*9)+(6*0)+(5*1)+(4*2)+(3*6)+(2*0)+(1*8)=102 102 % 10 = 2 So 90126-08-2 is a valid CAS Registry Number.