The CAS Registry Mumber 114544-58-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,4,5,4 and 4 respectively; the second part has 2 digits, 5 and 8 respectively. Calculate Digit Verification of CAS Registry Number 114544-58: (8*1)+(7*1)+(6*4)+(5*5)+(4*4)+(3*4)+(2*5)+(1*8)=110 110 % 10 = 0 So 114544-58-0 is a valid CAS Registry Number.