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 D03 Heterocyclic Compounds D006571 +
  D03.383 Heterocyclic Compounds, 1-Ring D006573 +
    D03.383.066 Azepines D001381 +
    D03.383.082 Azetines D001385 +
    D03.383.097 Azirines D001389 +
    D03.383.113 Azocines D001392 +
    D03.383.129 Azoles D001393 +
    D03.383.231 Dioxins D004147 +
    D03.383.246 Dioxoles D004149 +
    D03.383.312 Furans D005663 +
    D03.383.374 Imidazoles D007093 +
    D03.383.411 Lactams D007769 +
    D03.383.517 Oxathiins D010075 +
    D03.383.533 Oxazines D010078 +
    D03.383.548 Oxazoles D010080 +
    D03.383.564 Oxepins D010082 
    D03.383.606 Piperazines D010879 +
    D03.383.621 Piperidines D010880 +
    D03.383.663 Pyrans D011714 +
    D03.383.679 Pyrazines D011719 +
    D03.383.694 Pyrazoles D011720 +
    D03.383.710 Pyridazines D011724 +
    D03.383.725 Pyridines D011725 +
    D03.383.742 Pyrimidines D011743 +
    D03.383.757 Pyrroles D011758 +
    D03.383.773 Pyrrolidines D011759 +
    D03.383.855 Thiazines D013843 +
    D03.383.871 Thiazoles D013844 +
    D03.383.886 Thiepins D013846 +
    D03.383.903 Thiophenes D013876 +
    D03.383.931 Triazines D014227 +
    D03.383.946 Triazoles D014230 +
    D03.383.585 Oxocins D035964