Stereo parity

Figure 2 illustrates diversity in the fatty acid types and compositions of the TAG. The mono-acid and mixed-acid TAG are defined, respectively, on whether the fatty acid chains are of the same fatty acid molecules or not. Even for the monoacid TAG, the diversity maintains in chainlength and parity (odd or even numbers of carbon atoms) of the fatty acids, the number and position of the double bond and the conformation of the double bond, cis or trans, etc. As for the mixed-acid TAG, polymorphic diversity is superimposed over that of the mono-acid TAG in the form of sn (stereo-specific numbered) position. 

In case (b), a definite stereo-structure characterizes the growing end-group. Such a structure, but not its parity, affects the probability of creation of a mezo or racemic diad in a process of formation of a new center, the cation playing an important role in the transition state of the addition. In the absence of interaction between the last and penulti-... 

The up/down appearance of stereo bonds. (This does not imply that other modes corrupt stereochemistry. However, they are free to alter the graphical appearance as long as the true parity is preserved.)... 

Once the optimal parity record has been identified, the respective stereo lists are generated and the BRCT is assembled on the basis of the numbering of the final spanning tree. 

This finishes the specification of the atoms which constitute a compound. Again, the definition was simplified, and the specification of both atom symbol and atom attribute was not further elaborated. For atom symbol, the terms should be self-explaining. The atom attributes allow a very precise specification of the properties of an atom. The attributes atom stereo descriptor, coordination, and atom parity flag are part of the stereochemistry description. The different counts and the valency are just positive integers, the cartesian coordinates are provided for a graphical display of a structure with a suitable program. 

---