The CAS Registry Mumber 22362-16-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,2,3,6 and 2 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 22362-16: (7*2)+(6*2)+(5*3)+(4*6)+(3*2)+(2*1)+(1*6)=79 79 % 10 = 9 So 22362-16-9 is a valid CAS Registry Number.