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, d. n., heterociklične spojine z dušikovimi heteroatomi, ki imajo v strukturi nekondenziran pirazolov, pirimidinski, piperazinski, nekondenziran triazinski obroč ali naprej nekondeniziran fenotiazinov obroč, hidantoin in njegovi derivati