The CAS Registry Mumber 32454-19-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,2,4,5 and 4 respectively; the second part has 2 digits, 1 and 9 respectively. Calculate Digit Verification of CAS Registry Number 32454-19: (7*3)+(6*2)+(5*4)+(4*5)+(3*4)+(2*1)+(1*9)=96 96 % 10 = 6 So 32454-19-6 is a valid CAS Registry Number.