– Belumosudil, also known as KD-025 and WHO11343, is an orally bioavailable inhibitor of ROCK-II that is greater than 200-fold selective over ROCK-I (IC50s = 105 nM and 24 ?M, respectively). Belumosudil (SLx-2119; 40 ?M) induces significant down-regulations of Tsp-1 and CTGF mRNA levels in PASMC.