The CAS Registry Mumber 95454-43-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,4,5 and 4 respectively; the second part has 2 digits, 4 and 3 respectively. Calculate Digit Verification of CAS Registry Number 95454-43: (7*9)+(6*5)+(5*4)+(4*5)+(3*4)+(2*4)+(1*3)=156 156 % 10 = 6 So 95454-43-6 is a valid CAS Registry Number.