The CAS Registry Mumber 94903-43-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,9,0 and 3 respectively; the second part has 2 digits, 4 and 3 respectively. Calculate Digit Verification of CAS Registry Number 94903-43: (7*9)+(6*4)+(5*9)+(4*0)+(3*3)+(2*4)+(1*3)=152 152 % 10 = 2 So 94903-43-2 is a valid CAS Registry Number.