Abstract
A biologically active and strongly fluorescent marine base, paragracine (1), was isolated from an anthozoan, Parazoanthus gracilis (LWOWSKY), and the structure of 1 was determined to be 2-dimethylamino-6-methyl-8-methylamino-1H-1, 3, 7, 9-tetrazacyclopent-[e] azulene. Chemical reactions were also carried out to investigate the reactivity of 1.