The CAS Registry Mumber 115562-46-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,5,5,6 and 2 respectively; the second part has 2 digits, 4 and 6 respectively. Calculate Digit Verification of CAS Registry Number 115562-46: (8*1)+(7*1)+(6*5)+(5*5)+(4*6)+(3*2)+(2*4)+(1*6)=114 114 % 10 = 4 So 115562-46-4 is a valid CAS Registry Number.