Query on IUPAC nomenclature of coordination complexes

[Wrichik Basu]

I could finally get a copy of the Red Book 2005 from a library. In the chapter dedicated to nomenclature of coordinate complexes, while explaining the κ-system of specifying donor atoms, the following two examples were given (among many others):

Can anyone explain how the naming is done for the two compounds (labelled 2 and 3 in the picture)? The problem that I am facing is with the closed rings. From where is the naming started?

 

[jbsteele]

For compound 2:This compound is named using the κ-system of specifying donor atoms. According to this system, the first donor atom listed is the atom that is attached to the central metal ion. In this case, the first donor atom is nitrogen, which is attached to the central iron(III) ion. The second donor atom is oxygen, which is connected to the nitrogen atom. The third donor atom is carbon, which is connected to the oxygen atom. The fourth donor atom is the sulfur atom, which is connected to the carbon atom. This completes the donor atom list, so the full name of this compound is (κ3-N,O,C,S)-iron(III) complex. For compound 3:This compound is also named using the κ-system of specifying donor atoms. The first donor atom listed is the atom that is attached to the central metal ion. In this case, the first donor atom is nitrogen, which is attached to the central iron(III) ion. The second donor atom is oxygen, which is connected to the nitrogen atom. The third donor atom is carbon, which is connected to the oxygen atom. The fourth donor atom is sulfur, which is connected to the carbon atom. The fifth donor atom is the chlorine atom, which is connected to the sulfur atom. This completes the donor atom list, so the full name of this compound is (κ4-N,O,C,S,Cl)-iron(III) complex.