The CAS Registry Mumber 39322-33-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,9,3,2 and 2 respectively; the second part has 2 digits, 3 and 3 respectively. Calculate Digit Verification of CAS Registry Number 39322-33: (7*3)+(6*9)+(5*3)+(4*2)+(3*2)+(2*3)+(1*3)=113 113 % 10 = 3 So 39322-33-3 is a valid CAS Registry Number.