The CAS Registry Mumber 114431-63-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,4,4,3 and 1 respectively; the second part has 2 digits, 6 and 3 respectively. Calculate Digit Verification of CAS Registry Number 114431-63: (8*1)+(7*1)+(6*4)+(5*4)+(4*3)+(3*1)+(2*6)+(1*3)=89 89 % 10 = 9 So 114431-63-9 is a valid CAS Registry Number.