Ensaculin (Anseculin), a novel benzopyrone partially substituted with piperazine, showed memory-enhancing effects in passive and conditioned avoidance paradigms in normal and artificially amnesic rodents.

Mahanimbine is found in the roots, leaves and stems of Murraya koenigii and is an orally active alkaloid extracted from Murraya koenigii.

2-Hydroxypyridine is the catalyst for generating β-oxopropyl carbonates from cyclic carbonates and alcohols and in the aminolysis of a polyglutamate.