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# Functionality overview
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## Basics
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- Input/Output: SMILES/SMARTS, SDF, TDT, SLN [1](#footnote1), Corina mol2 [1](#footnote1), PDB
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- Input/Output: SMILES/SMARTS, SDF, TDT, SLN [1](#footnote1), Corina mol2 [1](#footnote1), PDB, sequence notation, FASTA (peptides only), HELM (peptides only)
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- Substructure searching
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- Canonical SMILES
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- Chirality support (i.e. R/S or E/Z labeling)
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- Chemical reactions
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- Molecular serialization (e.g. mol \<-\> text)
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- 2D depiction, including constrained depiction
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- Fingerprinting: Daylight-like, atom pairs, topological torsions, Morgan algorithm, “MACCS keys”, etc.
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- Fingerprinting: Daylight-like, atom pairs, topological torsions, Morgan algorithm, “MACCS keys”, extended reduced graphs, etc.
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- Similarity/diversity picking
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- Gasteiger-Marsili charges
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- Bemis and Murcko scaffold determination
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- Functional-group filters
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## 2D
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- 2D pharmacophores [1](#footnote1)
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- Hierarchical subgraph/fragment analysis
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- RECAP and BRICS implementations
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- Multi-molecule maximum common substructure [2](#footnote2)
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- Functional group filtering
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- Molecular descriptor library:
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- Topological (κ3, Balaban J, etc.)
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- Compositional (Number of Rings, Number of Aromatic Heterocycles, etc.)
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- Electrotopological state (Estate)
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- clogP, MR (Wildman and Crippen approach)
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- “MOE like” VSA descriptors
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- MQN [6](#footnote6)
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- Similarity Maps [7](#footnote7)
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- Machine Learning:
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- Clustering (hierarchical, Butina)
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- Information theory (Shannon entropy, information gain, etc.)
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- Tight integration with the [IPython](http://ipython.org) notebook and [Pandas](http://pandas.pydata.org/).
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- 2D pharmacophores [1](#footnote1)
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- Hierarchical subgraph/fragment analysis
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- RECAP and BRICS implementations
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- Multi-molecule maximum common substructure [2](#footnote2)
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- Functional group filtering
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- Enumeration of molecular resonance structures
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- Molecular descriptor library:
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- Topological (κ3, Balaban J, etc.)
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- Compositional (Number of Rings, Number of Aromatic Heterocycles, etc.)
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- Electrotopological state (Estate)
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- clogP, MR (Wildman and Crippen approach)
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- “MOE like” VSA descriptors
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- MQN [6](#footnote6)
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- Similarity Maps [7](#footnote7)
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- Machine Learning:
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- Clustering (hierarchical, Butina)
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- Information theory (Shannon entropy, information gain, etc.)
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- Tight integration with the [IPython](http://ipython.org) notebook and [Pandas](http://pandas.pydata.org/).
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## 3D
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- 2D-\>3D conversion/conformational analysis via distance geometry
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- 2D-\>3D conversion/conformational analysis via distance geometry, including optional use of experimental torsion angle potentials.
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- UFF and MMFF94/MMFF94S implementations for cleaning up structures
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- Pharmacophore embedding (generate a pose of a molecule that matches a 3D pharmacophore) [1](#footnote1)
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- Feature maps
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@@ -13,6 +13,8 @@ Maciek Wojcikowski
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- Addition of parsers/writers for sequence notation, FASTA, and basic HELM
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- Improved conformation generation based on experimental torsional parameters
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- Much better filtering of generated conformations to ensure they
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match the chirality of the input structure
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- New method for enumerating molecular resonance structures
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- Addition of a molecular FilterCatalog data structure
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