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MET: a Java package for fast molecule equivalence testing.

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Journal of Cheminformatics
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Summary

This study introduces a faster algorithm for testing molecular equivalence in cheminformatics by using distinctive atom labels based on chemical properties. The open-source Java implementation significantly outperforms existing methods for molecular structure comparison.

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Molecular graphMolecule equivalenceMolecule isomorphism

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Area of Science:

  • Cheminformatics
  • Computational Chemistry
  • Graph Theory

Background:

  • Determining 2D structural equivalence of molecules is crucial in cheminformatics.
  • This problem is mathematically equivalent to solving graph isomorphism for labeled graphs.

Purpose of the Study:

  • To develop a novel, efficient algorithm for testing molecular equivalence.
  • To improve upon existing methods in terms of speed and applicability.

Main Methods:

  • Exploiting chemical properties and local atomic neighborhoods to create distinctive node labels.
  • Utilizing these characteristic labels for effective molecule partitioning and equivalence testing.
  • Implementing the algorithm in an open-source Java package compatible with CDK.

Main Results:

  • The developed algorithm demonstrates significantly faster performance compared to existing implementations in SMSD, CDK, and RDKit.
  • The approach effectively handles isotopes and molecules with radicals.
  • Extensive computational experiments validate the algorithm's efficiency.

Conclusions:

  • The new algorithm provides a highly efficient solution for 2D molecular structure equivalence testing.
  • The open-source Java implementation offers a practical tool for the cheminformatics community.
  • This method advances the capabilities for analyzing molecular structures, including complex cases with isotopes and radicals.