In August 2018, FDA approved PIFELTRO (doravirine) as a HIV-1 infection drug. It contains 1,2,4-triazolone moiety in its backbone. This fact could not pass unnoticed. That is why we have prepared a set of 77 1,2,4-triazolones and their nearest derivatives to power up your research. Please visit to search in 100 million building blocks, fragments, and screening compounds.