The CAS Registry Mumber 93598-02-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,3,5,9 and 8 respectively; the second part has 2 digits, 0 and 2 respectively. Calculate Digit Verification of CAS Registry Number 93598-02: (7*9)+(6*3)+(5*5)+(4*9)+(3*8)+(2*0)+(1*2)=168 168 % 10 = 8 So 93598-02-8 is a valid CAS Registry Number.