NAE-IN-M22 (NEDD8 inhibitor M22) is a selective, potent and reversible inhibitor of NEDD8 activating enzyme (NAE). NAE-IN-M22 inhibits multiple cancer cell lines and induces apoptosis in A549 cells. NAE-IN-M22 also can inhibit tumor growth in vivo.

PYZD-4409 is a selective UBA1 inhibitor with an IC50 of 20 μM. PYZD-4409 induces cell death in malignant cells and is preferentially cytotoxic to malignant cells over normal hematopoietic cells.

Idasanutlin (Ro 5503781) (RG-7388) is an effective and specific p53-MDM2 inhibitor (IC50: 6 nM).

NSC-697923 (2-[(4-methylphenyl)sulfonyl]-5-nitrofuran), a potent inhibitor of UBE2N (ubiquitin-conjugating enzyme E2 N, Ubc13), exhibits its role in inducing cell death in neuroblastoma (NB) cells through two distinct mechanisms. In p53 wild-type NB cells, NSC-697923 promotes the nuclear importation of p53, thereby triggering cell death. Meanwhile, in p53 mutant NB cells, NSC-697923 activates the JNK-mediated apoptotic pathway, leading to cell death. Additionally, NSC-697923 inhibits DNA damage and NF-κB signaling, further contributing to its antitumor activity.

PYR-41 is the first cell-permeable inhibitor of ubiquitin-activating enzyme E1, with no activity at E2.

RG7112 (RO5045337) (RO5045337) is an orally bioavailable and selective p53-MDM2 inhibitor.