Drug nomenclature principles

The active principles of the drug are present in the resin which contains about 30 derivatives of 2-(2-isopropyl-5-methylphenyl)-5-pentylresorcinol, known as cannabinoids. Considerable confusion exists in the nomenclature, depending on whether they are numbered as substituted monoterpenes or dibenzopyrans. To avoid confusion the dibenzofuran system is used in this volume. 

The position of double bonds can be designated in any of the various ways shown below. Double bonds from Cti nu go toward C9 or Cl4. and those from C20 may go toward C2I or C22. In such cases, both carbons are indicated in the name if the double bond is not between sequential ) numbered carbons (e.g.. 5steroid nomenclature are applied to naming several comniun steroid drugs shown in Figure 23-1. 

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