streptomyces toxytricini streptomyces toxytricini streptomyces toxytricini is a gram-positive bacterium belonging to the genus streptomyces. it produces the pancreatic lipase inhibitor lipstatin, of which the antiobesity drug orlistat is a derivative. streptomyces toxytricini scientific classification domain: bacteria phylum: actinomycetota class: actinomycetia order: streptomycetales family: streptomycetaceae genus: streptomyces species: s. toxytricini binomial name streptomyces toxytricinipreobrazhenskaya & sveshnikova 1957