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2D structures
The downloadable file contains 2D structures as MDL text in an SD file for all released NSCs. The SD file also includes the below compound information. These data can be downloaded individually in separate files, as shown in the Other Compound Identifiers table.
- CAS Number
- PubChem SID
- SMILES Strings
- Chemical Names
Data File Size | Download Size | Link | Version | |
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2D Structures | 515 MB | 66 MB | 2D_Structures.zip | July 2024 |
Other Compound Identifiers
Identifier | File Size | Link | Version |
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CAS Numbers | 3.7 MB | nsc_cas.csv |
July 2024 | ||
PubChem SID & CID | 6.9 MB | nsc_sid_cid.csv |
July 2024 | ||
SMILES Strings | 16 MB | nsc_smiles.csv |
July 2024 | ||
Chemical Names | 12 MB | nsc_chemcal_name.csv |
July 2024 |
Old Versions
NSC_CAS_Sept2013.csv NSC to CAS number. We only have CAS number for 130,893 NSCs.
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divii_mlsmr.csv NSC to PubChem SID for the Diversity Set.
2D structures (Old Versions)
All Open (June 2016 Release) 284176 compounds. 81 MB compressed, uncompresses to 710 MB
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All Open (March 2012 Release) 273885 compounds. 64 MB compressed, uncompresses to 648 MB
3D structures (Old Versions)
SMILES strings (Old Versions)
SMILES strings - 237,771 structures in SMILES format. This database contains essentially all open structures in the NCI database up until about June, 1995. It includes metal-containing compounds and other 'weird stuff'. It is therefore up to the user to ascertain the usefulness of any of these SMILES strings for the intended purpose. Because different conversion programs produce different output, two versions of the SMILES database are provided.
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Converted using CACTVS 4.4 MB compressed using standard Unix compress, uncompresses to ca. 15 MB. (zip compressed ) The program CACTVS v. 3.2 was used to convert the connection tables to SMILES strings. Thanks to Wolf-Dietrich Ihlenfeldt for providing us with the conversion scripts handling the formal charge problem and other 'unusual stuff' in the NCI database.
Chemical Names (Old Versions)
chemnames_Aug2013.zip All chemical names available. First field is NSC number, second filed is the name and the third field is the name type (most just generic "Chemical Name"). The field separator is a "|". Note that we do not have chemical names for most of the compounds and many of the names that are there are systematic names that might not be very useful for searching.
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