The CAS Registry Mumber 96352-17-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,3,5 and 2 respectively; the second part has 2 digits, 1 and 7 respectively. Calculate Digit Verification of CAS Registry Number 96352-17: (7*9)+(6*6)+(5*3)+(4*5)+(3*2)+(2*1)+(1*7)=149 149 % 10 = 9 So 96352-17-9 is a valid CAS Registry Number.