komposti eteroċikliċi beteroatom[i] tannitroġenu biss li fihom piridine bċirku mhux fuż idroġenat jew le flistruttura (minbarra pyridine piperidine alfentanil inn anileridine inn bezitramide inn bromazepam inn difenoxin inn diphenoxylate inn dipipanone inn fentanyl inn ketobemidone inn metilphenidate inn pentazocine inn pethidine inn pethidine inn intermediate a phencyclidine innpcp phenoperidine inn pipradol inn piritramide inn propiram inn trimeperidine inn u limlieħ tagħhom)