ABT-239 is an H₃-receptor inverse agonist developed by Abbott. It has stimulant and nootropic effects, and has been investigated as a treatment for ADHD, Alzheimer's disease, and schizophrenia. ABT-239 is more active at the human H₃ receptor than comparable agents such as thioperamide, ciproxifan, and cipralisant. It was ultimately dropped from human trials after showing the dangerous cardiac side effect of QT prolongation, but is still widely used in animal research into H₃ antagonists / inverse agonists.

Franz Wilhelm Abt (22 December 1819 – 31 March 1885) was a German composer and choral conductor. He composed roughly 3,000 individual works mostly in the area of vocal music. Several of his songs were at one time universally sung, and have obtained a more or less permanent place in the popular repertory. During his lifetime, Abt was a renowned choral conductor and he spent much of the last three decades of his life working as a guest conductor with choirs throughout Europe and in the United States.

Abt was born at Eilenburg in Prussian Saxony, and showed musical talent at an early age. His father was a clergyman and a talented pianist, and it is he who gave Franz his earliest instruction in music. Like his father, Abt was interested in both music and theology, and he followed both pursuits at the Thomasschule Leipzig and the University of Leipzig with the ultimate intention of becoming a member of the clergy. While in school, Abt became friends with Albert Lortzing, Felix Mendelssohn, and Robert Schumann.