Lactones n.e.c., heterocyclic compounds with nitrogen hetero-atom(s) only, containing an unfused pyrazole ring, a pyrimidine ring, a piperazine ring, an unfused triazine ring or a phenothiazine ring system not further fused, hydantoin and its derivatives
Laktoni, heterociklične spojine z dušikovimi heteroatomi, spojine s fenotiazinovim obroččem