The CAS Registry Mumber 99314-95-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,3,1 and 4 respectively; the second part has 2 digits, 9 and 5 respectively. Calculate Digit Verification of CAS Registry Number 99314-95: (7*9)+(6*9)+(5*3)+(4*1)+(3*4)+(2*9)+(1*5)=171 171 % 10 = 1 So 99314-95-1 is a valid CAS Registry Number.