The CAS Registry Mumber 119336-19-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,9,3,3 and 6 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 119336-19: (8*1)+(7*1)+(6*9)+(5*3)+(4*3)+(3*6)+(2*1)+(1*9)=125 125 % 10 = 5 So 119336-19-5 is a valid CAS Registry Number.