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nojirimycin

n. An antibiotic, produced by some strains of ''Streptomyces'', that inhibits glucosidases

Wikipedia
Nojirimycin

Nojirimycin is the parent compound of a class of antibiotics and glycosidase inhibitors. Nojirimycin and its derivatives are mainly obtained from a class of Streptomyces species. Chemically, it is an iminosugar.