Scheme 1

Supramolecular heterosynthons that can be formed between carboxylic acids heterocyclic nitrogen of the AMPY: (a) hetero trimer (HT) (Synthon type-I) (b) linear hetero tetramer (LHT) (Synthon type-II).
Supramolecular heterosynthons that can be formed between carboxylic acids heterocyclic nitrogen of the AMPY: (a) hetero trimer (HT) (Synthon type-I) (b) linear hetero tetramer (LHT) (Synthon type-II).