 Robinhood, a free app offering commission-free trading of stocks, options, and more, has attracted a lot of attention in recent months. Among Robinhoods 100 most popular stocks, the highest-rated according to Wall Street analysts are Catalyst Pharmaceuticals NASDAQ: CPRX, Corbus Pharmaceuticals NASDAQ: CRBP, and Alibaba NYSE: BABA. Although most investors recognize e-commerce giant Alibaba as a sort of Amazon equivalent primarily operating in China, the two pharmaceutical stocks remain largely unknown. 