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Cheminformatics

Controllable Molecular Generative Foundation Models

Yihan Zhu, Yuhan Liu, Weijiang Li, Tengfei Luo, Meng Jiang

Featured May 29, 2026

Original Paper

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Simply

By teaching AI to build molecules using meaningful chemical blocks instead of tiny atoms, the authors created a smart design tool that can reliably create new molecules with specific desired traits.

In depth
The paper introduces CoMole, a controllable molecular generative foundation model that overcomes the limitations of atom-level reinforcement learning (RL) in molecular design. It achieves this by learning a motif-aware graph space where RL optimizes conditional reverse policies over chemically meaningful decisions, rather than fragile atom-wise actions. This approach stabilizes policy updates and significantly improves controllability and chemical validity across diverse molecular inverse design tasks.

Key Takeaways

  • 1
    The authors propose CoMole, the first family of controllable molecular generative foundation models for heterogeneous inverse design, achieving state-of-the-art controllability across nine diverse targets.
  • 2
    They address the fragility of atom-level RL in molecular generation by introducing a motif-aware graph diffusion pipeline, which enables RL to optimize over chemically meaningful substructures, leading to robust policy updates and high chemical validity.
  • 3
    The study demonstrates that CoMole can transfer controllability to unseen properties by only optimizing task embeddings while keeping the generator frozen, highlighting its potential for scalable and data-efficient extension to new design tasks.

Conceptual Flow

HIGH LEVEL
1
Methodology (The Logic)

The system learns to build molecules using big chemical pieces, then gets better at making specific kinds of molecules by trying and getting rewards.

Raw Molecule Data
Learn Chemical Pieces
Motif Building Blocks
2
Results (The Impact)

This new way of building molecules makes them much more controllable and valid, even for new properties it hasn't seen before.

Old Molecule Builders
Often Fail / Unreliable
New Molecule Builder
Reliable Designs