Birinapant binds with XIAP and cIAP1 with K of 45 and <1 nM, respectively.

GDC-0152 is a potent inhibitor of IAPs and binds to the XIAP BIR3 domain, the BIR domain of ML-IAP, and the BIR3 domains of cIAP1 and cIAP2 with K (i) values of 28, 14, 17, and 43 nM, respectively.

AT406 is a potent and orally bioavailable Smac mimetic and an antagonist of the inhibitor of apoptosis proteins (IAPs), AT-406 binds to XIAP, cIAP1, and cIAP2 proteins with K (i) of 66.4, 1.9, and 5.1 nM, respectively.

AZD5582 is a class of dimeric Smac mimetics as potent IAP antagonist and binds potently to the BIR3 domains of cIAP1, cIAP2, and XIAP (IC50 = 15, 21, and 15 nM, respectively).

Embelin, a quinone isolated from the Japanese Ardisia herb, is an inhibitor of X-linked inhibitor of apoptosis (XIAP) with IC50 of 4.1 μM in a cell-free assay.