Which statement best describes a lead-like library?

Question

BlackTom AI · Accepted Answer

Lead-like libraries consist of compounds whose physicochemical profiles are tailored to be good starting points for medicinal chemistry optimization toward drug candidates — i.e., they are closer in properties to potential drugs than very small fragments or macromolecules.

1) Relevant knowledge points and concepts
- Fragment-like vs lead-like vs drug-like: Fragment libraries typically contain very small, low molecular weight compounds (MW < ~250). Lead-like compounds are larger than fragments but smaller and simpler than final drug-like molecules (typical lead-like guidelines: MW ≈ 250–350, cLogP modest, few rotatable bonds). Drug-like (Lipinski) space generally allows MW up to ~500 and broader complexity.  
- Purpose of a lead-like library: to provide molecules that are synthetically tractable and have properties amenable to optimization (potency, selectivity, ADME) into clinical candidates.  
- Biologics/peptides and blanket exclusion of H-bond donors are not characteristic definitions of lead-like collections.

2) Step-by-step reasoning
- Compare each option to the definitions above. Option (a) describes fragment-like libraries (extremely small molecules), not lead-like. Option (b) states the library contains compounds with properties closer to potential drug candidates — this matches the purpose and definition of lead-like sets. Option (c) restricts the library to biologics and peptides, which are not what “lead-like” usually denotes (lead-like refers to small molecules). Option (d) claims exclusion of hydrogen bond donors for higher efficiency; while H-bond counts are considered, leads are not defined by wholesale exclusion of H-bond donors.

3) Calculations
- No numeric calculation required; comparison is conceptual based on typical molecular weight and property ranges given above.

4) Why the correct answer is correct
- Lead-like libraries are designed to occupy intermediate chemical space that is conducive to optimization into drug candidates, so option (b) directly captures that intent.

5) Why other options are incorrect (brief)
- (a) describes fragment libraries, (c) mislabels biologics/peptides as lead-like, (d) incorrectly claims blanket exclusion of H-bond donors.

Conclusion: The correct answer is b. It contains compounds with properties closer to potential drug candidates.

Which statement best describes a lead-like library?单项选择题

类似问题

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