Any organic ion with a net positive charge.
| Member | Definition | Role |
|---|
| 1-tuberculosinyladenosine | An organic cation that is adenosine alkylated at position N1 by a tuberculosinyl group. | 1-tuberculosinyladenosine(1+) |
| 3,7-bis(dimethylamino)phenothiazin-5-ium | An organic cation that is phenothiazin-5-ium substituted by dimethylamino groups at positions 3 and 7. The chloride salt is the histological dye 'methylene blue'. | 3,7-bis(dimethylamino)phenothiazin-5-ium |
| 7-methylguanosine | A positively charged methylguanosine in which a single methyl substituent is located at position 7. | 7-methylguanosine |
| 7-methylinosine | A positively charged methylinosine in which a single methyl substituent is located at position 7 on the hypoxanthine ring. | 7-methylinosine |
| chelerythrine | A benzophenanthridine alkaloid isolated from the root of Zanthoxylum simulans, Chelidonium majus L., and other Papaveraceae. | chelerythrine |
| chelirubine | A benzophenanthridine alkaloid that is sanguinarine bearing a methoxy substituent at position 10. | chelirubine |
| chloroeremomycin | An organic cation obtained by deprotonation of the carboxy group and protonation of the three amino functions of chloroeremomycin; major species at pH 7.3. | chloroeremomycin(2+) |
| diphenyleneiodonium | An organic cation that is fluorene in which the methylene group is replaced by a positively charged iodine. | dibenziodolium |
| diquat | The organic cation formed formally by addition of an ethylene bridge between the nitrogen atoms of 2,2'-bipyridine. Most often available as the dibromide. | diquat |
| homoserine lactone | The conjugate acid of homoserine lactone; major species at pH 7.3. | homoserinium lactone |
| macrocin | An organic cation that is the conjugate acid of macrocin, obtained by protonation of the tertiary amino group; major species at pH 7.3. | macrocin(1+) |
| nitroblue tetrazolium | | nitro blue tetrazolium(2+) |
| nostocarboline | A member of the class of beta-carbolines that is 9H-beta-carbolin-2-ium substituted by a chloro group at position 6 and a methyl group at position 2. It is isolated from a fresh water cyanobacterium Nostoc 78-12A and acts as an inhibitor of butyrylcholinesterase. | nostocarboline |
| oxazine 1 | | oxazine-1 |
| oxomethylium | Conjugate acid of carbon monoxide arising from protonation of the carbon; major species at pH 7.3. | carbon monoxide(1+) |
| paraquat | An organic cation that consists of 4,4'-bipyridine bearing two N-methyl substituents loctated at the 1- and 1'-positions. | paraquat |
| rhodamine 123 | A cationic fluorescent dye derived from 9-phenylxanthene. | rhodamine 123(1+) |
| s-adenosylmethionine | A zwitterionic tautomer of S-adenosyl-L-methionine arising from shift of the proton from the carboxy group to the amino group. | S-adenosyl-L-methionine zwitterion; S-adenosyl-L-methionine |
| sepantronium | An organic cation that is 1-(2-methoxyethyl)-2-methyl-1H-naphtho[2,3-d]imidazole-4,9-dione in which the nitrogen at position 3 of the napthoimidazole moiety has been alkylated by a pyrazin-2-ylmethyl group. | sepantronium |
| trimethylselenonium | An organic cation consisting of three methyl groups covalently bound to a central selenium atom. | trimethylselenonium |
| triphenyltetrazolium | An organic cation that is tetrazole carrying three phenyl substituents at positions 2, 3 and 5. | 2,3,5-triphenyltetrazolium |
| zm323881 | A member of the class of quinazolines carrying 2-fluoro-4-methyl-5-hydroxyanilino and benzyloxy substituents at positions 4 and 7 respectively. | ZM 323881 |