The CAS Registry Mumber 69412-49-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,9,4,1 and 2 respectively; the second part has 2 digits, 4 and 9 respectively. Calculate Digit Verification of CAS Registry Number 69412-49: (7*6)+(6*9)+(5*4)+(4*1)+(3*2)+(2*4)+(1*9)=143 143 % 10 = 3 So 69412-49-3 is a valid CAS Registry Number.