The story
From the sponge Topsentia + -in.
Etymology from Wiktionary, CC BY-SA 4.0.
topsentin
Today it means: A bis(indolyl)imidazole alkaloid derived from sponges, (6-hydroxy-1H-indol-3-yl)-[5-(1H-indol-3-yl)-1H-imidazol-2-yl]methanone Full definition →