The CAS Registry Mumber 85258-95-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,5,2,5 and 8 respectively; the second part has 2 digits, 9 and 5 respectively. Calculate Digit Verification of CAS Registry Number 85258-95: (7*8)+(6*5)+(5*2)+(4*5)+(3*8)+(2*9)+(1*5)=163 163 % 10 = 3 So 85258-95-3 is a valid CAS Registry Number.