According to NYTimes:
"George Rieveschl, was an assistant professor researching muscle-relaxing drugs at the University of Cincinnati in the early 1940s when he realized the powerful potential of that 19-syllable antihistamine compound, then being tested as a muscle relaxer.
Because he had invented the drug before he worked for the company, Dr. Rieveschl received a 5 percent royalty for the 17-year length of the patent. Based on sales that rose to about $6 million a year by the early 1960s, that proved quite lucrative for him.
“If I had found an art job back in the ’30s, I would have taken it,” Dr. Rieveschl told The Cincinnati Post. “It seemed like bad luck at the time, but it ended up working out pretty well.”
George Rieveschl, 91, Allergy Reliever, Dies. NYTimes.
Image source: Diphenhydramine structure, Wikipedia, public domain.