Cell-permeable. WP1130 acts as a partly selective DUB (deubiquitinases) inhibitor, directly inhibiting DUB activity of USP9x, USP5, USP14, and UCH37, which are known to regulate survival protein stability and 26S proteasome function. WP1130-mediated inhibition of tumor-activated DUBs results in downregulation of antiapoptotic and upregulation of proapoptotic proteins, such as MCL-1 and p53. Blocks JAK2 signaling via JAK2 ubiquitination. MW: 384.27. Purity ≥98% by TLC