The CAS Registry Mumber 76926-92-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,6,9,2 and 6 respectively; the second part has 2 digits, 9 and 2 respectively. Calculate Digit Verification of CAS Registry Number 76926-92: (7*7)+(6*6)+(5*9)+(4*2)+(3*6)+(2*9)+(1*2)=176 176 % 10 = 6 So 76926-92-6 is a valid CAS Registry Number.