The CAS Registry Mumber 82562-41-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,2,5,6 and 2 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 82562-41: (7*8)+(6*2)+(5*5)+(4*6)+(3*2)+(2*4)+(1*1)=132 132 % 10 = 2 So 82562-41-2 is a valid CAS Registry Number.