The CAS Registry Mumber 85485-01-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,5,4,8 and 5 respectively; the second part has 2 digits, 0 and 1 respectively. Calculate Digit Verification of CAS Registry Number 85485-01: (7*8)+(6*5)+(5*4)+(4*8)+(3*5)+(2*0)+(1*1)=154 154 % 10 = 4 So 85485-01-4 is a valid CAS Registry Number.