A 'high-quality' lead compound has the following desirable qualities

Question

BlackTom AI · Accepted Answer

High-quality lead compounds are typically smaller and less lipophilic because those properties improve the chances of developing a safe, orally bioavailable drug.

1) Relevant knowledge points and concepts
- Lead compound: an early molecule with measurable activity that will be optimized for potency, selectivity, and ADME (absorption, distribution, metabolism, excretion).  
- Drug‑likeness rules: Lipinski’s Rule of Five, ligand efficiency concepts, and guidelines on rotatable bonds and molecular weight favor moderate size, moderate polarity, and limited lipophilicity (logP).  
- ADME/toxicity: high lipophilicity often causes poor solubility, high plasma protein binding, metabolic instability and off‑target promiscuity.

2) Step‑by‑step reasoning
- Smaller molecular weight gives more room to add functional groups during optimization without exceeding desirable size limits (e.g., MW <500 and often <350 for leads).  
- Lower lipophilicity (lower logP) improves aqueous solubility and reduces nonspecific hydrophobic interactions, lowering toxicity and clearance issues.  
- Compact, less lipophilic leads tend to have better ligand efficiency (potency per heavy atom), making optimization more efficient.

3) Calculations
- No numeric calculation required; but conceptually: improving ligand efficiency means maximizing binding energy per heavy atom, which favors smaller starting scaffolds.

4) Why the correct answer is correct
- “Smaller and less lipophilic” produces better starting points for optimization: better solubility, reduced off‑target binding, improved ADME and synthetic tractability, and greater scope to raise potency without creating liabilities.

5) Why other options are incorrect
- a. Low potency: undesirable — leads should have at least measurable potency to optimize.  
- b. Large and very lipophilic: leads to poor solubility, high protein binding, metabolic problems and toxicity.  
- c. Very rotatable structure: many rotatable bonds increase entropy penalty on binding, reduce oral bioavailability and conformational stability.

Conclusion: The best description is d. smaller and less lipophilic, which matches the provided correct answer.

A 'high-quality' lead compound has the following desirable qualitiesSingle choice

Similar Questions

Library design in PDD;

Which statement best describes a lead-like library?

A 'high-quality' lead compound has the following desirable qualities

What are 5 of the issues that may need to be addressed in the decision-making process when choosing a lead compound?在选择先导化合物时，决策过程中可能需要解决的五个问题有哪些？

Lead compounds can only come from natural sources

Lipinski's rule of 5 (Ro5) is applicable to the development of: Select all correct answers.

Lead compounds for new drugs can only be synthesized.

Which stages commonly include evaluation of compound safety? (Select all that apply)

More Practical Tools for Students Powered by AI Study Helper

Homework AI Solver

Stylized AI Paper Writer

Plagiarism Checker Assistant

Citation AI Academic Writing Tool

In-Class Translation Assistant

AI Note Generator

AI Quiz Answers

Past Exam Questions from University Test Bank

Smart Practice Assistant

Adaptive Practice

Making Your Study Simpler