What is "castanospermine"

n. (context organic compound English) A pyrrolizidine alkaloid, found in seeds of trees of the genus (taxlink Castanosperma genus noshow=1), that is a glucosidase inhibitor

Castanospermine is an indolizidine alkaloid first isolated from the seeds of Castanospermum australe. It is a potent inhibitor of some glucosidase enzymes and has antiviral activity in vitro and in mouse models.