#chemical_group__group__radical  (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
  supertype:  #building_block__unit  a single undivided natural entity occurring in the composition of something else; "units of nucleic acids"
  part of:  #molecule
  subtype:  #acyl_group__acyl  any group or radical of the form RCO- where R is an organic group; "an example of the acyl group is the acetyl group"
     subtype:  #acetyl_radical__acetyl__acetyl_group__ethanoyl_group__ethanoyl_radical  the organic group of acetic acid (CH3CO-)
  subtype:  #alcohol_group__alcoholgroup__alcohol_radical__alcoholradical  the chemical group -OH
  subtype:  #aldehyde_group__aldehyde_radical  the chemical group -CHO
  subtype:  #alkyl_radical__alkylradical__alkyl__alkyl_group__alkylgroup  any of a series of univalent groups of the general formula CnH2n+1 derived from aliphatic hydrocarbons
     subtype:  #ethyl_radical__ethylradical__ethyl__ethyl_group__ethylgroup  the univalent hydrocarbon radical C2H5 derived from ethane by the removal of one hydrogen atom
     subtype:  #methyl_radical__methyl__methyl_group  the univalent radical CH3- derived from methane
        subtype:  #aminomethane  a methyl with the hydrogen atom replaced by an amino radical
        subtype:  #hydroxymethyl  a methyl with hydroxide replacing the hydrogen atoms
  subtype:  #allyl_radical__allylradical__allyl__allylgroup  the univalent unsaturated organic radical C3H5; derived from propylene
  subtype:  #azido_group__azidogroup__azido_radical__azidoradical  the univalent group N3- derived from hydrazoic acid
  subtype:  #azo_group__azogroup__azo_radical__azoradical  the bivalent group -N=N- united to two hydrocarbon groups
  subtype:  #benzyl_radical__benzyl__benzyl_group  the univalent radical derived from toluene
  subtype:  #benzoyl_group__benzoyl_radical  the univalent radical derived from benzoic acid
  subtype:  #cacodyl_radical__cacodyl__cacodylgroup__arsenic_group  the univalent group derived from arsine
  subtype:  #carbonyl_group  the bivalent radical CO
  subtype:  #carboxyl_group__carboxyl  the univalent radical COOH; present in and characteristic of organic acids
  subtype:  #chromophore  the chemical group that gives color to a molecule
  subtype:  #cyano_group__cyano_radical__cyanoradical__cyanide_group__cyanide_radical  the monovalent group -CN in a chemical compound
  subtype:  #glyceryl  a trivalent radical derived from glycerol by removing the three hydroxyl radicals
  subtype:  #hydrazo_group__hydrazogroup__hydrazo_radical__hydrazoradical  the bivalent group -HNNH- derived from hydrazine
  subtype:  #hydroxyl_radical__hydroxyl__hydroxyl_group  the monovalent group -OH in such compounds as bases and some acids and alcohols
  subtype:  #ketone_group  a group having the characteristic properties of ketones
  subtype:  #methylene_group__methylenegroup__methylene_radical__methyleneradical__methylene  the bivalent radical CH2 derived from methane
  subtype:  #propyl_radical__propyl__propyl_group  the monovalent organic group C3H7- obtained from propane
  subtype:  #nitrate  the radical -NO3 or any compound containing it (such as a salt or ester of nitric acid)
     subtype:  #calcium_nitrate__calciumnitrate  a deliquescent salt (Ca(NO3)2) that is soluble in water; sometimes used as a source of nitrogen in fertilizers
     subtype:  #cellulose_nitrate__cellulosenitrate__nitrocellulose__guncotton__nitrocotton  nitric acid esters; used in lacquers and explosives
        subtype:  #pyrocellulose  nitrocellulose containing less nitrogen than guncotton; used in making smokeless powder
        subtype:  #pyroxylin__pyroxyline  highly flammable nitrocellulose used in making collodion and plastics and lacquers
     subtype:  #sodium_nitrate__soda_niter  (NaNO3) used especially as a fertilizer and explosive
     subtype:  #potassium_nitrate__potassiumnitrate__saltpeter__saltpetre__niter__nitre  (KNO3) used especially as a fertilizer and explosive
     subtype:  #nitroglycerin__nitroglycerine__trinitroglycerin__glyceryl_trinitrate__glyceryltrinitrate__Nitrospan__Nitrostat  a heavy yellow poisonous oily explosive liquid obtained by nitrating glycerol; used in making explosives and medically as a vasodilator (trade names Nitrospan and Nitrostat)
     subtype:  #ammonium_nitrate  used as an explosive and fertilizer and rocket propellant
     subtype:  #silver_nitrate  a nitrate used in making photographic emulsions; also used in medicine as a cautery and as a topical anti-infective agent
        subtype:  #lunar_caustic__lunarcaustic  silver nitrate fused into sticks and formerly used as a caustic
     subtype:  #uranyl_nitrate  a yellow salt obtained by the reaction of uranium salts with nitric acid
  subtype:  #nitrite  the radical -NO2 or any compound containing it (such as a salt or ester of nitrous acid)
     subtype:  #sodium_nitrite  nitrite used to preserve and color food especially in meat and fish products; implicated in the formation of suspected carcinogens
  subtype:  #uranyl_radical__uranyl__uranyl_group  the bivalent radical UO2 which forms salts with acids
  subtype:  #vinyl_radical__vinylradical__vinyl__vinyl_group__vinylgroup  a univalent chemical radical derived from ethylene

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