The CAS Registry Mumber 114423-69-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,4,4,2 and 3 respectively; the second part has 2 digits, 6 and 9 respectively. Calculate Digit Verification of CAS Registry Number 114423-69: (8*1)+(7*1)+(6*4)+(5*4)+(4*2)+(3*3)+(2*6)+(1*9)=97 97 % 10 = 7 So 114423-69-7 is a valid CAS Registry Number.