2,2-Difluoropropane

2,2′-Bipyridine

2,2-Dimethylpentane

2,2'-Dipyridylamine

2,2-Dimethylbutane

2,2-Diethoxytetrahydrofuran

2,2'-Azobis(2-amidinopropane) dihydrochloride

2,2'-Biquinoline

2,2',3,3',4,4'-Hexachlorobiphenyl

2,2'-Dipyrromethene

2,2-Dimethoxypropane

2,2'-Bipyrimidine

2,2'-Dipyridyldisulfide

2,2'-Biphenylene phosphorochloridite

2,2-Di-2-furylpropane

Dimethyl-2,2'-bipyridine

Disodium 4,4'-dinitrostilbene-2,2'-disulfonate

2,2-Dichloro-1,1,1-trifluoroethane

2,2-dialkylglycine decarboxylase (pyruvate)

2,2'-Bis(2-indenyl) biphenyl

1-Bromo-2,2-dimethylpropane

2,2'-Bithiazole

4,4′-Diamino-2,2′-stilbenedisulfonic acid

5-(3,4-diacetoxybut-1-ynyl)-2,2'-bithiophene deacetylase

2,2-Dimethyl-1-butanol

2,2-Dimethoxy-2-phenylacetophenone

2,2'-Difluorofentanyl

2,2'-Bithiophene

2,2-Diphenylpropylamine

2,2',2''-Nitrilotriacetonitrile

Transition metal complexes of 2,2'-bipyridine

Dimethylolpropionic acid

DDT-dehydrochlorinase

Dichlorodifluoroethylene

Diethyl diethylmalonate

Acetoxybutynylbithiophene deacetylase

Nicotine blue oxidoreductase

2,2-Dichloropropionic acid

Alanopine dehydrogenase

Dichloroacetamide

Tetrabromobisphenol A

Azobisisobutyronitrile

Diethylenetriamine

Tris(bipyridine)ruthenium(II) chloride

Acesulfame potassium

Tetrachloro-1,1-difluoroethane

Tert-Butylphosphaacetylene

Dimethylaminopivalophenone

Bisphenol A diglycidyl ether

Tris(2-aminoethyl)amine

Diethylene glycol

Tetracyanomethane

Neopentyl alcohol

Dichlorodiphenyldichloroethane

Trimethyltrienolone

Methyl pivalate

Bicinchoninic acid

Bromodifluoroacetyl chloride

Bis(chloroethyl) ether

Pentaerythritol

Triethanolamine

Dichloroacetyl chloride

Dihydroxymalonic acid

Methyldiethanolamine

F-22 (psychedelic)

2-Hydroxyisobutyric acid

Alpinumisoflavone

Trichloroethylene