Polydentate donor-atom symbol

Donor atom symbol as the index. A polydentate ligand possesses more than one donor site, some or all or which may be involved in coordination. Thus, dithiooxalate anion conceivably may be attached through 5 or O, and these were distinguished by dithioox-alato-5,.S and dithiooxalato-0,0, respectively. 

---