Everything I've been able to find out about the drug (which is a prodrug, I could glean that it becomes KP-1212 inside the cells, in a process involving triphosphorylation) sounds very promising except that latest information is from the year 2011.
https://pubmed.ncbi.nlm.nih.gov/21032953/ says or asks "KP-1461: a novel anti-HIV drug in limbo? "
https://go.drugbank.com/drugs/DB05644 says "Phase 2 trials terminated". I don't know what that means.
Wikipedia says, "KP-161 is an experimental antiviral drug being studied for the treatment of HIV/AIDS. It belongs to the class of nucleoside reverse transcriptase inhibitors.
KP-1461 is a prodrug of the active antiviral agent KP-1212." and that's all it says.
Given that this drug was being touted in the mainstream media in 2005 as a possible cure for AIDS, e.g. https://www.seattletimes.com/business/biotech-firm-launches-test-of-hiv-drug/, and in 2011 e.g. https://www.fastcompany.com/1774219/new-plan-mutate-hiv-out-existence, I can't understand how it has seemingly been forgotten about.
Also, if it works to eradicate HIV from the human body, it might do the same thing with a coronavirus, as well as with other pesky viruses such as hepatitis c.
https://en.wikipedia.org/wiki/Koronis_Pharmaceuticals describes the company behind KP-1461 in the present tense, and yet a glance at the numerous references shows that they are all from 2011 or earlier.
So my question is: was KP-1461 found to be not a good drug?