TLC plate showing the different polarities of diastereoisomers 6A,D-di-C-allyl-substituted nonadecaned-O-benzylated β-cyclodextrin in pentane/ethyl acetate 4:1 eluent (left). The figure shows how steric hindrance of the subsequent glucose residue prevents the C-6 substituent from entering the tg conformation, thus forcing each diastereomer to adopt the conformer shown (right).