https://www.ncbi.nlm.nih.gov/Structure/pdb/2XPW
2XPW: TetR(D) in complex with oxytetracycline and magnesium
TETRACYCLINE REPRESSOR PROTEIN CLASS D2-(N-MORPHOLINO)-ETHANESULFONIC ACIDCHLORIDE IONMAGNESIUM IONOXYTETRACYCLINE
complexoxytetracyclinemagnesium