Definition: Parent substance of the natural dye orcein, obtained from certain colorless lichens (Lecanora tinctoria, Rocella tinctoria) by treatment with boiling water; used as an external antiseptic in various skin diseases and in chemistry as a reagent for pentoses.
Synonym(s): 5-methylresorcinol, orcin
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Examples: glitazone, GI cocktail, etc.
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