21. The stereochemistry of the product again illustrates the preference for additions from the backside. 22. The proper stereochemistry was not proven until 1994. 23. The stereochemistry of macromolecules can be defined even more precisely with the introduction of triads. 24. Show stereochemistry as necessary as well ( see the Tetrahydrocannibinol example, bottom right ). 25. The structure and stereochemistry of samandarin was confirmed in 1961 using X-ray crystallography. 26. The absolute stereochemistry of the two stereocenters is controlled by the chirality in the auxiliary. 27. The relative and absolute stereochemistry of filipin III was determined by 13C NMR acetonide analysis. 28. This drew him into the field of stereochemistry where his most notable achievements were made. 29. Reviews on the mechanism, stereochemistry , and applications of the reaction have been published. 30. The C-4 stereochemistry of leucocyanidin substrates affects anthocyanidin synthase ( ANS ) products.
