The CAS Registry Mumber 95454-46-9 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 6 respectively. Calculate Digit Verification of CAS Registry Number 95454-46: (7*9)+(6*5)+(5*4)+(4*5)+(3*4)+(2*4)+(1*6)=159 159 % 10 = 9 So 95454-46-9 is a valid CAS Registry Number.