The CAS Registry Mumber 114926-77-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,1,4,9,2 and 6 respectively; the second part has 2 digits, 7 and 7 respectively. Calculate Digit Verification of CAS Registry Number 114926-77: (8*1)+(7*1)+(6*4)+(5*9)+(4*2)+(3*6)+(2*7)+(1*7)=131 131 % 10 = 1 So 114926-77-1 is a valid CAS Registry Number.