The CAS Registry Mumber 95349-81-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,3,4 and 9 respectively; the second part has 2 digits, 8 and 1 respectively. Calculate Digit Verification of CAS Registry Number 95349-81: (7*9)+(6*5)+(5*3)+(4*4)+(3*9)+(2*8)+(1*1)=168 168 % 10 = 8 So 95349-81-8 is a valid CAS Registry Number.