The CAS Registry Mumber 94593-58-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,5,9 and 3 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 94593-58: (7*9)+(6*4)+(5*5)+(4*9)+(3*3)+(2*5)+(1*8)=175 175 % 10 = 5 So 94593-58-5 is a valid CAS Registry Number.