The CAS Registry Mumber 92569-16-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,2,5,6 and 9 respectively; the second part has 2 digits, 1 and 6 respectively. Calculate Digit Verification of CAS Registry Number 92569-16: (7*9)+(6*2)+(5*5)+(4*6)+(3*9)+(2*1)+(1*6)=159 159 % 10 = 9 So 92569-16-9 is a valid CAS Registry Number.