The CAS Registry Mumber 35922-43-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,5,9,2 and 2 respectively; the second part has 2 digits, 4 and 3 respectively. Calculate Digit Verification of CAS Registry Number 35922-43: (7*3)+(6*5)+(5*9)+(4*2)+(3*2)+(2*4)+(1*3)=121 121 % 10 = 1 So 35922-43-1 is a valid CAS Registry Number.