The CAS Registry Mumber 80519-92-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,0,5,1 and 9 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 80519-92: (7*8)+(6*0)+(5*5)+(4*1)+(3*9)+(2*9)+(1*2)=132 132 % 10 = 2 So 80519-92-2 is a valid CAS Registry Number.