The CAS Registry Mumber 161468-22-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,1,4,6 and 8 respectively; the second part has 2 digits, 2 and 2 respectively. Calculate Digit Verification of CAS Registry Number 161468-22: (8*1)+(7*6)+(6*1)+(5*4)+(4*6)+(3*8)+(2*2)+(1*2)=130 130 % 10 = 0 So 161468-22-0 is a valid CAS Registry Number.