Someone who speaks Korean may have to go through the original paper. It is LK-99 though; I wonder if they tried 99 other combinations first!
Lee and Kim first discovered the material in 1999 and have spent 20 years doing other things in between getting help to figure out how to isolate LK-99 and reproduce the correct grain structure.
They eventually got a world class physical chemist, Kwon.
There is now a huge bust up within the team, hence the muddled race to publish and claim credit.