The CAS Registry Mumber 94017-85-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,0,1 and 7 respectively; the second part has 2 digits, 8 and 5 respectively. Calculate Digit Verification of CAS Registry Number 94017-85: (7*9)+(6*4)+(5*0)+(4*1)+(3*7)+(2*8)+(1*5)=133 133 % 10 = 3 So 94017-85-3 is a valid CAS Registry Number.