Spojevi koji sadrže pirimidinski prsten (hidrogeniran ili ne) ili piperazinski prsten u strukturi (isključujući malonilureu (barbiturnu kiselinu) i njezine soli))
Fenolftaleín; kyselina 1-hydroxy-4-[1-(4-hydroxy-3-metoxykarbonyl-1-naftyl)-3-oxo-1H,3H-benzo[de]izochromén-1-yl]-6-oktadecyloxy-2-naftoová; 3′-chlór-6′-cyklohexylaminospiro[izobenzofurán-1(3H),9′-xantén]-3-ón; 6′-(N-etyl-p-toluidín)-2′-metylspiro[izobenzofurán-1(3H),9′-xantén]-3-ón; metyl-6-dokosyloxy-1-hydroxy-4-[1-(4-hydroxy-3-metyl-1-fenantryl)-3-oxo-1H,3H-nafto[1,8-cd]pyrán-1-yl]naftalén-2-karboxylát, gama-Butyrolaktón