Indazole, also called benzpyrazole or isoindazone, is a heterocyclic aromatic organic compound. Indazole derivatives display a broad variety of biological activities. Indazoles are rare in nature. The alkaloids Nigellicine, Nigeglanine, and Nigellidine are indazoles. Nigellicine was isolated from the widely distributed plant Nigella sativa L. (bla...