The CAS Registry Mumber 92411-05-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,2,4,1 and 1 respectively; the second part has 2 digits, 0 and 5 respectively. Calculate Digit Verification of CAS Registry Number 92411-05: (7*9)+(6*2)+(5*4)+(4*1)+(3*1)+(2*0)+(1*5)=107 107 % 10 = 7 So 92411-05-7 is a valid CAS Registry Number.