The CAS Registry Mumber 34867-44-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,4,8,6 and 7 respectively; the second part has 2 digits, 4 and 4 respectively. Calculate Digit Verification of CAS Registry Number 34867-44: (7*3)+(6*4)+(5*8)+(4*6)+(3*7)+(2*4)+(1*4)=142 142 % 10 = 2 So 34867-44-2 is a valid CAS Registry Number.