The CAS Registry Mumber 86652-08-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,6,6,5 and 2 respectively; the second part has 2 digits, 0 and 8 respectively. Calculate Digit Verification of CAS Registry Number 86652-08: (7*8)+(6*6)+(5*6)+(4*5)+(3*2)+(2*0)+(1*8)=156 156 % 10 = 6 So 86652-08-6 is a valid CAS Registry Number.