The CAS Registry Mumber 53259-04-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,3,2,5 and 9 respectively; the second part has 2 digits, 0 and 4 respectively. Calculate Digit Verification of CAS Registry Number 53259-04: (7*5)+(6*3)+(5*2)+(4*5)+(3*9)+(2*0)+(1*4)=114 114 % 10 = 4 So 53259-04-4 is a valid CAS Registry Number.