7 Appendix
Table 22 (continued)
Trivial name
Estrone
Lanosterol
Lithocholic acid
Progesterone
Testosterone
Modified types
Semisystematic name
3-Hydroxy-I,3,S( 1 0)-estratrien-17 -one
8,24-Lanostadien-3 f3-o1
3a-Hydroxy-5 f3-cholanoic- 24-acid
4-Pregnene-3,20-dione
17 f3- Hydroxy-4-androsten-3-one
203
Additional linking of two C-atoms is characterized by the prefix eydo placed after the
pertaining locant and stereo designators.
Me
3a,S-Cyclo-Sa-pregnane
11f3,19-Cyclo-Sa-androstane
Ring cleavage is indicated accordingly with the prefix seco.
HO
2,3-Seco-Sa-pregnane
3-Hydroxy-16,17 -seco-I,3,S( 10)6( e )stratriene-16, 17 -dioic acid
Elimination of a ::CHrgroup from a side chain or of a methyl group from the skeleton
is indicated by the prefix nor coming behind the locant of the omitted group.
H
24-Nor -5 f3-cholane
18,19-Dinor-Sa-pregnane