Heterocyclic Compound

Molecule with one or more rings composed of different elements

or…
Antimony
Oxygen
Nitrogen
Sulfur
Sulfuric Acid
Silicon
Selenium
Tin
Boron
or…
Arsenic
Phosphorus
Chemical Element
Bismuth
Starch
Uric Acid
Indigo Dye
Organic Chemistry
Tellurium
or…
Germanium
Tetrahydrofuran
Piperidine
Quinoline
Pyridine
Ethylene Oxide
Imidazole
Chargaff's Rules
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