Fig. 2. Molecular structures of 2A (a and b), 2B (c and d), 3A (e and f), and 3B (g and h). (a) and (b) A pair of enantiomers in the racemic crystals of 2A, specifically M,R-2 for (a) and P,S-2 for (b).¹⁶ Similarly, P,R-2 for (c), M,S-2 for (d), M,R-3 for (e), P,S-3 for (f), P,R-3 for (g), and M,S-3 for (h). C₆F₅ groups and the hydrogen atoms attached to carbon atoms are omitted for clarity.