The CAS Registry Mumber 141312-39-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,1,3,1 and 2 respectively; the second part has 2 digits, 3 and 9 respectively. Calculate Digit Verification of CAS Registry Number 141312-39: (8*1)+(7*4)+(6*1)+(5*3)+(4*1)+(3*2)+(2*3)+(1*9)=82 82 % 10 = 2 So 141312-39-2 is a valid CAS Registry Number.