The CAS Registry Mumber 162492-15-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,2,4,9 and 2 respectively; the second part has 2 digits, 1 and 5 respectively. Calculate Digit Verification of CAS Registry Number 162492-15: (8*1)+(7*6)+(6*2)+(5*4)+(4*9)+(3*2)+(2*1)+(1*5)=131 131 % 10 = 1 So 162492-15-1 is a valid CAS Registry Number.