The CAS Registry Mumber 412338-32-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 4,1,2,3,3 and 8 respectively; the second part has 2 digits, 3 and 2 respectively. Calculate Digit Verification of CAS Registry Number 412338-32: (8*4)+(7*1)+(6*2)+(5*3)+(4*3)+(3*8)+(2*3)+(1*2)=110 110 % 10 = 0 So 412338-32-0 is a valid CAS Registry Number.