chemistry

GTS-21

GTS-21 is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand GTS-21 rather than just read about it. In short: GTS-21 (also known as DMXBA or DMBX-anabaseine) is an investigational new drug being studied for the treatment of neurodegenerative diseases and psychiatric disorders, as well as for its potential to enhance memory and cognitive function. Despite study of the molecule since 1990s, as of 2025 it has not been shown to be effective in clinical trials.

Key takeaways

GTS-21 belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect GTS-21 to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of GTS-21 from memory before moving on to harder problems.

Reference excerpt

GTS-21 (also known as DMXBA or DMBX-anabaseine) is an investigational new drug being studied for the treatment of neurodegenerative diseases and psychiatric disorders, as well as for its potential to enhance memory and cognitive function. Despite study of the molecule since 1990s, as of 2025 it has not been shown to be effective in clinical trials. GTS-21 is a derivative of the natural product anabaseine that acts as a partial agonist at neural nicotinic acetylcholine receptors (nAChRs). It binds to both the α4β2 and α7 subtypes, but activates only the α7 to any significant extent. Activation of the α7 nAChR has been shown to have neuroprotective effects which has made GTS-21 a focus of research in the treatment of neurological diseases. The laboratory name GTS-21 means that it was the 21st chemical compound created by Gainesville (University of Florida in Gainesville) and Tokushima (Taiho Pharmaceutical) Scientists while DMXBA stands for 3–2,4-dimethoxybenzylidene anabaseine.

Research and clinical trial history In early research in the 1990s, GTS-21 and its active metabolites were shown to improve cognition in healthy adult men (nootropic effect) as well as neuroprotective effects in animal models and neuronal cell cultures. The results of early studies led to GTS-21 being investigated for the treatment of Alzheimer's disease, nicotine dependence, and for schizophrenia. Despite promising early research, clinical trials using GTS-21 have failed to show clinically significant efficacy and, as of 2025, no trial has proceeded beyond phase 2. Trials using DMXBA to treat schizophrenia were completed in the 2000s but these trials were discontinued during phase II. More recent trials focusing on other neurological diseases including Alzheimer's, Autism, ADHD, and nicotine use have also been discontinued or withdrawn.

See also List of investigational cognition and memory disorder drugs

References

Illustrations

Worked examples

Example 1 — a first encounter with GTS-21

Start with the simplest possible case. Write down what GTS-21 claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to GTS-21 before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about GTS-21 ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of GTS-21

In research: GTS-21 appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses GTS-21 in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: GTS-21 is common in secondary-school and first-year university syllabi. It links to neighbouring topics 3-Pyridyl compounds, Antipsychotics, Dimethoxyphenyl compounds, so understanding it makes those chapters shorter.
In everyday life: Look for GTS-21 outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study GTS-21 in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what GTS-21 means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain GTS-21 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is GTS-21 in simple terms?

Why does GTS-21 matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study GTS-21?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on GTS-21.