... European Journal of Medicinal Chemistry. ... the reagents, in the HMQC spectra showed δ H = 11.58 (s, 1H) and δ H = 11.24 (s, 1H) belonged to the Pyrrole–NH or –CONH–; δ H = 7.02 (d, 1H) and δ H = 6.95 (d, 1H) belonged to the Ar–H, which was confirmed by their J value (J ...