The CAS Registry Mumber 85156-95-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,5,1,5 and 6 respectively; the second part has 2 digits, 9 and 5 respectively. Calculate Digit Verification of CAS Registry Number 85156-95: (7*8)+(6*5)+(5*1)+(4*5)+(3*6)+(2*9)+(1*5)=152 152 % 10 = 2 So 85156-95-2 is a valid CAS Registry Number.