The CAS Registry Mumber 113741-92-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,3,7,4 and 1 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 113741-92: (8*1)+(7*1)+(6*3)+(5*7)+(4*4)+(3*1)+(2*9)+(1*2)=107 107 % 10 = 7 So 113741-92-7 is a valid CAS Registry Number.