It is an anti-malarial drug that has been studied for possible benefits for people who have the coronavirus, but several studies have shown it does not have value. (I didnt want to give any information that might steer the course of illness in another direction.) I would never have guessed that was how diseases worked, but I am not a medical doctor. I am sure that would have solved it. I have no further questions. Yesterday and today, he was not on oxygen. Well, Im reassured!
The study showed negative results.
( z0 show :ARG0 ( z1 study ) :ARG1 ( z2 thing :ARG0-of ( z3 negative ) :ARG2-of ( z4 result ) ) )
(z0 / show-01
    :ARG0 (z1 / study)
    :ARG1 (z2 / thing
              :ARG0-of (z3 / negative-02)
              :ARG2-of (z4 / result-01)))
The study showed negative results .
z0 :ARG0 z1
z2 :ARG0-of z3
z0 :ARG1 z2
z2 :ARG2-of z4