Careful attribution: Janssen's team made the RACEMATE, tetramisole (code R 8299), reported in Nature and J Med Chem in 1966 with Janssen as senior author. Levamisole is the levorotatory enantiomer, and the resolution of dl-tetramisole was published in 1968 by Bullock, Hand and Waletzky at American Cyanamid (https://pubmed.ncbi.nlm.nih.gov/5637168/). So the scaffold and the anthelmintic discovery are Janssen's lab; the single-enantiomer drug as such is not cleanly his. Its presence on this site is as a cocaine adulterant, which has nothing to do with either group.