ATRA-hydroxyimino, also known as CRABP-II ligand 1, is a chemical compound derived from Retinoic acid (ATRA). This compound binds to the cIAP1 ligand, specifically Bestatin, through a linker, resulting in the formation of a complex called SNIPER. The purpose of this complex is to degrade CRABP-II within IMR-32 cells[1].