{'fraction_non_alphanumeric': 0.026737967914438502, 'fraction_numerical': 0.008912655971479501, 'mean_word_length': 6.025, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Acid-induced molecular folding and unfolding of N-methyl aromatic amide bearing 2,6-disubstituted pyridines.

The structural features and conformational conversion of the N-methyl pyridyl amide oligomer bearing 2,6-disubstituted pyridines were investigated. 1H NMR and X-ray crystallography revealed that the environment-responsive type of conformational control can be performed. The amide bond switching together with intramolecular hydrogen-bonding effects caused dynamic protonation-associated conformational conversion from layered to spiral and then flat.