Rings and nitrogen atoms

Fig. 9.1 -5 Structures of synthetic drugs and natural products, (a) Representative examples of approved synthetic drugs, which are often rich in aromatic rings and nitrogen atoms, (b) Representative examples of clinically used natural products,... 

When a chain or ring system is composed entirely of alternating silicon and oxygen atoms, the parent name siloxane is used with a multiplying affix to denote the number of silicon atoms present. The parent name silazane implies alternating silicon and nitrogen atoms multiplying affixes denote the number of silicon atoms present. 

Boyd G. V. Five-Membered Ring Systems With Oxygen and Nitrogen Atoms... 

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