The CAS Registry Mumber 86563-14-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,6,5,6 and 3 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 86563-14: (7*8)+(6*6)+(5*5)+(4*6)+(3*3)+(2*1)+(1*4)=156 156 % 10 = 6 So 86563-14-6 is a valid CAS Registry Number.