The CAS Registry Mumber 94297-19-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,4,2,9 and 7 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 94297-19: (7*9)+(6*4)+(5*2)+(4*9)+(3*7)+(2*1)+(1*9)=165 165 % 10 = 5 So 94297-19-5 is a valid CAS Registry Number.