The CAS Registry Mumber 95145-72-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,1,4 and 5 respectively; the second part has 2 digits, 7 and 2 respectively. Calculate Digit Verification of CAS Registry Number 95145-72: (7*9)+(6*5)+(5*1)+(4*4)+(3*5)+(2*7)+(1*2)=145 145 % 10 = 5 So 95145-72-5 is a valid CAS Registry Number.