--- title: "A brief introduction to the concepts of large molecules/small molecules in biopharmaceuticals:" type: "Topics" locale: "en" url: "https://longbridge.com/en/topics/32657213.md" description: "$XTALPI(02228.HK) Explain these concepts (small molecules, large molecules, ADC, molecular glue) in plain language, using examples and analogies, suitable for professionals without a biopharmaceutical background to quickly understand. As a shareholder, in case you need to brag, without understanding the professional terms, it always feels like something is missing. Let me fill that in for you..." datetime: "2025-08-06T11:25:12.000Z" locales: - [en](https://longbridge.com/en/topics/32657213.md) - [zh-CN](https://longbridge.com/zh-CN/topics/32657213.md) - [zh-HK](https://longbridge.com/zh-HK/topics/32657213.md) author: "[老板的老板 AI Exec](https://longbridge.com/en/profiles/123.md)" --- # A brief introduction to the concepts of large molecules/small molecules in biopharmaceuticals: > $XTALPI(02228.HK) Explain these concepts (small molecules, large molecules, ADC, molecular glue) in simple language, using examples and analogies, suitable for professionals without a biomedical background to quickly understand. As a shareholder, in case you need to brag, without understanding the professional terms, it always feels like something is missing. Here's what you need. [https://mp.weixin.qq.com/s/CRK3NOaM370PSu12U\_Cxag](https://mp.weixin.qq.com/s/CRK3NOaM370PSu12U_Cxag) * * * ## 🧬 1. What are "small molecule" drugs? ### ✅ Simple understanding: Imagine swallowing a pill. The main ingredient in this pill is very, very small, **as small as a tiny screw**, and can travel into various cells and organs of your body, reaching the target (such as a disease-causing protein) and "blocking" it to stop its activity. These are called **small molecule drugs**. ### 🧪 Characteristics: Feature Description Small molecular weight Usually < 900 daltons Chemical synthesis Can be manufactured in the lab through chemical reactions Oral administration Most can be taken as tablets or capsules Fast absorption Easily enters cells and spreads throughout the body ### 📌 Examples: Aspirin (painkiller) Statins (cholesterol-lowering drugs) Imatinib (cancer drug Gleevec) * * * ## 🧬 2. What are "large molecule" drugs? ### ✅ Simple understanding: Compared to the "small molecule" "screw," **large molecule drugs are as big as a small boat**, more complex, more advanced, and generally "cultivated" from biological organisms (such as cells). They are often **proteins or antibodies** that can accurately recognize "enemies" in your body (such as viruses or cancer cells) and stop their activity. ### 🧪 Characteristics: Feature Description Large molecular weight Usually \> 10,000 daltons, hundreds of times larger than "small molecules" Biopharmaceutical Cannot be chemically synthesized; must be cultivated from cells Cannot be taken orally Usually administered by injection or infusion (otherwise, stomach acid will "digest" them) Highly targeted More like a "missile"—specifically targeting certain points ### 📌 Examples: Insulin (for diabetes) Trastuzumab (Herceptin, for breast cancer) COVID-19 vaccines (mRNA or antibody-based vaccines are also large molecules) * * * ## 🔗 3. What is ADC (antibody-drug conjugate)? ### ✅ Simple understanding: > It attaches "small molecule drugs" (poison) **to "large molecule antibodies" (missiles)**, specifically delivering them to cancer cells or diseased areas to release the drug. It's like: Using antibodies as "missile guidance heads" to identify targets Using small molecule drugs as "bombs" for precise delivery ### 🧪 Characteristics: Feature Description High precision Only targets cancer cells, avoiding harm to normal cells High toxicity The small molecule part can be very toxic because it doesn't spread randomly Complex manufacturing Higher production difficulty, but strong efficacy and good targeting ### 📌 Examples: Enhertu Roche's Kadcyla * * * ## 🧲 4. What is "molecular glue"? ### ✅ Simple understanding: > It doesn't traditionally "block" disease proteins but **acts like glue, sticking to the disease protein and dragging it away to be "destroyed."** It **doesn't directly inhibit function but causes the entire protein to be degraded!** This is a very popular new mechanism in recent years: Not "shooting the target" but "calling security to remove the target" It uses the body's own protein degradation system (called the "ubiquitin-proteasome system") to clear abnormal proteins ### 📌 Examples: Molecular glue is a representative of Degrader drugs, such as: C4 Therapeutics Arvinas products * * * ## 🧠 Summary comparison table: Category What's it like? Composition Advantages Examples Small molecule Screw Small chemically synthesized compounds Oral administration, cheap Aspirin, Imatinib Large molecule Missile Proteins, antibodies, etc. Strong targeting, precise Insulin, antibody drugs ADC Missile + bomb Antibody + small molecule drug Precise delivery, no collateral damage Enhertu, Kadcyla Molecular glue Glue + police Recruits security to clear proteins Innovative mechanism, broad action ARV-110, etc. * * * ## 🧬 Summary of Jingtai Technology's technical advantages: Rare capability to simultaneously develop all four types of drugs; Uses AI + robotic experiments to improve drug discovery efficiency and reduce failure rates; Covers everything from "molecule design" to "toxicity/efficacy prediction" to "synthesis route planning"; Has rich real-world projects and data to feed AI models, making them smarter over time. ### Related Stocks - [02228.HK](https://longbridge.com/en/quote/02228.HK.md) ## Comments (4) - **Ω骑墙派 · 2025-08-07T01:29:11.000Z**: Bro, after reading it, can we brag now? Feels like bragging also requires professional knowledge😂 - **大象上的蚂蚁 · 2025-08-06T11:57:44.000Z**: Boss, what do you think about the next few days? Will it remain stable? - **老板的老板 AI Exec** (2025-08-06T12:13:28.000Z): Unpredictable.