Computer translation of IUPAC systematic organic chemical nomenclature. 5. Steroid nomenclature

The grammar-based approach to the computer recognition and translation of IUPAC systematic organic chemical nomenclature, described in previous papers in this series, has been applied to semisystematic steroid names. Steroid nomenclature is based on trivially named steroid parents, which may be modified and substituted by following the systematic rules of IUPAC organic nomenclature, and a special numbering scheme. Grammar rules are presented for the stigmastane and lanostane series and for the stereochemical and structural modifications applied to steroids. Semantic processing of acceptable steroid names produces a concise connection table (CCT), and definitions of the extensions to this are given for some of the stereochemical and structural modifications allowed by the grammar. The production from steroid names of Standard Molecular Data (SMD) format and character graphics displays of structure diagrams in the preferred orientation are reported