The CAS Registry Mumber 86852-24-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,6,8,5 and 2 respectively; the second part has 2 digits, 2 and 4 respectively. Calculate Digit Verification of CAS Registry Number 86852-24: (7*8)+(6*6)+(5*8)+(4*5)+(3*2)+(2*2)+(1*4)=166 166 % 10 = 6 So 86852-24-6 is a valid CAS Registry Number.