The CAS Registry Mumber 85254-01-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,5,2,5 and 4 respectively; the second part has 2 digits, 0 and 1 respectively. Calculate Digit Verification of CAS Registry Number 85254-01: (7*8)+(6*5)+(5*2)+(4*5)+(3*4)+(2*0)+(1*1)=129 129 % 10 = 9 So 85254-01-9 is a valid CAS Registry Number.