Molecule Preparation
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Gypsum-DL: Gypsum-DL is a software that transforms 1D and 2D small-molecule representations into 3D models, considering various isomeric and conformational states.
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Spores: check structure, protonation (standalone).
Protonation
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DiMorphite-DL: Dimorphite-DL: an open-source program for enumerating the ionization states of drug-like small molecules
Reviews
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Sherman et al: Protein and ligand preparation: parameters, protocols, and influence on virtual screening enrichments
Standardization
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Ambitcli: no 3D but Java application for standardization (standalone).
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ChEMBL_Structure_Pipeline (formerly standardiser): An open source chemical structure curation pipeline using RDKit
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QSAR-Ready (KNIME): Standardization workflow for QSAR-ready chemical structures pretreatment
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Standardiser: standardize molecules, it requires RDKIt (standalone).
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Standardize: PubChem chemical structure standardization (online).
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Standardized-smiles: Python script to standardize small molecules (use RDKIT) (standalone).
Tautomer Generation
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MolTaut: A Tool for the Rapid Generation of Favorable Tautomer in Aqueous Solution (compound preparation) (standalone).