The CAS Registry Mumber 93799-59-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,3,7,9 and 9 respectively; the second part has 2 digits, 5 and 9 respectively. Calculate Digit Verification of CAS Registry Number 93799-59: (7*9)+(6*3)+(5*7)+(4*9)+(3*9)+(2*5)+(1*9)=198 198 % 10 = 8 So 93799-59-8 is a valid CAS Registry Number.