Fig. 11
From: Development of an open-source software for isomer enumeration
Illustration of para stereoisomers. This relatively small molecule contains four true and three potential para stereocenters, with a total of 16 different stereoisomers. In the molecule on the top left, the true (half-)stereocenters are marked in yellow and the potential para stereocenters are marked in pink. With a total of seven stereocenters there could in principle be \(2^7=128\) stereoisomers. However, in many cases, one or more of the potential para stereocenters is not a stereocenter, and multiple stereo configurations actually correspond to the same stereoisomer