The CAS Registry Mumber 96973-19-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,6,9,7 and 3 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 96973-19: (7*9)+(6*6)+(5*9)+(4*7)+(3*3)+(2*1)+(1*9)=192 192 % 10 = 2 So 96973-19-2 is a valid CAS Registry Number.