The CAS Registry Mumber 2486-68-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,4,8 and 6 respectively; the second part has 2 digits, 6 and 8 respectively. Calculate Digit Verification of CAS Registry Number 2486-68: (6*2)+(5*4)+(4*8)+(3*6)+(2*6)+(1*8)=102 102 % 10 = 2 So 2486-68-2 is a valid CAS Registry Number.