The CAS Registry Mumber 53413-14-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,3,4,1 and 3 respectively; the second part has 2 digits, 1 and 4 respectively. Calculate Digit Verification of CAS Registry Number 53413-14: (7*5)+(6*3)+(5*4)+(4*1)+(3*3)+(2*1)+(1*4)=92 92 % 10 = 2 So 53413-14-2 is a valid CAS Registry Number.