4SC AG is a clinical-stage biopharmaceutical company, which engages in the development of small molecule drugs that target key indications in cancer. Its product pipeline includes resminostat and domatinostat. The company was founded by Stefan Busemann, Ulrich Dauer, Klaus-Peter Gulden, and Daniel Vitt in 1997 and is headquartered in Planegg-Martinsried, Germany.