The antibacterial assay of compounds 1–16 except 8 was evaluated
against Staphylococcus aureus ATCC 25922, Klepsiella pneumoniae ATCC
13883, Enterococcus faecalis ATCC 10541, Escherichia coli ATCC 11775
and Pseudomonas aeruginosa ATCC 27853. All the bacteria were obtained
from the American Type Culture Collection (Rockville, USA). The
antibacterial assay was carried out as described in the literature elsewhere
[16]