Search on: ONIUM COMPOUNDS 
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Descriptor English:   Onium Compounds 
Descriptor Spanish:   Compuestos Onio 
Descriptor Portuguese:   Oniocompostos 
Synonyms English:   Compounds, Onium  
Tree Number:   D02.675
Definition English:   Ions with the suffix -onium, indicating cations with coordination number 4 of the type RxA+ which are analogous to QUATERNARY AMMONIUM COMPOUNDS (H4N+). Ions include phosphonium R4P+, oxonium R3O+, sulfonium R3S+, chloronium R2Cl+ 
History Note English:   68 
Allowable Qualifiers English:  
AD administration & dosage AE adverse effects
AG agonists AN analysis
AI antagonists & inhibitors BL blood
CF cerebrospinal fluid CS chemical synthesis
CH chemistry CL classification
EC economics HI history
IM immunology IP isolation & purification
ME metabolism PK pharmacokinetics
PD pharmacology PO poisoning
RE radiation effects ST standards
SD supply & distribution TU therapeutic use
TO toxicity UR urine
Record Number:   10044 
Unique Identifier:   D009861 

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