Robuta

https://www.ncbi.nlm.nih.gov/Structure/pdb/3UPJ 3UPJ: HUMAN IMMUNODEFICIENCY VIRUS TYPE 2 PROTEASE MUTANT WITH LYS 57 REPLACED BY LEU (K57L)... HIV-2 PROTEASE4-HYDROXY-7-METHOXY-3-(1-PHENYL-PROPYL)-CHROMEN-2-ONE