The CAS Registry Mumber 4485-92-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,4,8 and 5 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 4485-92: (6*4)+(5*4)+(4*8)+(3*5)+(2*9)+(1*2)=111 111 % 10 = 1 So 4485-92-1 is a valid CAS Registry Number.