LEQ506, also known as NPV-LEQ506, is an orally bioavailable small-molecule Smoothened (Smo) antagonist with potential antineoplastic activity. Smoothened antagonist LEQ506 selectively binds to the Hedgehog (Hh)-ligand cell surface receptor Smo, which may result in the suppression of the Hh signaling pathway, thereby inhibiting tumor cell growth.
Zidovudine diphosphate is an antiretroviral medication used to prevent and treat HIV AIDS. It is of the nucleoside analog reverse-transcriptase inhibitor (NRTI) class. Zidovudine inhibits the enzyme (reverse transcriptase) that HIV uses to synthesize DNA, thus preventing viral DNA from forming.