The CAS Registry Mumber 96345-59-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,3,4 and 5 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 96345-59: (7*9)+(6*6)+(5*3)+(4*4)+(3*5)+(2*5)+(1*9)=164 164 % 10 = 4 So 96345-59-4 is a valid CAS Registry Number.