The CAS Registry Mumber 92091-36-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,2,0,9 and 1 respectively; the second part has 2 digits, 3 and 6 respectively. Calculate Digit Verification of CAS Registry Number 92091-36: (7*9)+(6*2)+(5*0)+(4*9)+(3*1)+(2*3)+(1*6)=126 126 % 10 = 6 So 92091-36-6 is a valid CAS Registry Number.