The supplementary material is freely available here:

https://www.science.org/action/downloadSupplement?doi=10.112...

It identifies the compound used as SW033291. Searching for it on clinicaltrials.gov gives no hits.

It does , however, provide the ApexBio catalog number A8709, which is this 15-PGDH inhibitor:

https://www.apexbt.com/sw033291.html