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
- Molecular Weight & Molecular Formula
| Data File Size | Download Size | Link | Version | |
|---|---|---|---|---|
| 2D Structures | 545 MB | 70 MB | 2D_Structures.zip | October 2024 |
Other Compound Identifiers
| Identifier | File Size | Link | Version |
|---|---|---|---|
| CAS Numbers | 3.7 MB | nsc_cas.csv | October 2024 |
| PubChem SID & CID | 7.0 MB | nsc_sid_cid.csv | October 2024 |
| SMILES Strings | 16 MB | nsc_smiles.csv | October 2024 |
| Chemical Names | 14 MB | nsc_chemical_name.csv | October 2024 |
| Molecular Weight & Molecular Formula | 7.2 MB | nsc_mw_mf.csv | October 2024 |
Old Versions
NSC_CAS_Sept2013.csv NSC to CAS number. We only have CAS number for 130,893 NSCs.
NSC_PubChemSID.csv NSC to PubChem SID. This is the SID from the DTP upload to PubChem.
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
All Open (Sept 2014 Release) 280816 compounds. 78 MB compressed, uncompresses to 732 MB
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.
Converted using Babel 4.2 MB compressed using standard Unix compress, uncompresses to ca. 15 MB. (zip compressed) The program Babel v. 1.6 was used to convert 3D coordinates, which had been generated by the program Corina v. 1.7 from the connection tables. (Babel needs 3D coordinates when reading SD files.) The resulting Babel output was modified by simple string substitution to solve the problem of nitro groups lacking formal charges, which leads many SMILES readers to create an -N-O-H group. Thus, N(=O)O was replaced by [N+](=O)[O-], and N(=O)(O) was replaced by [N+](=O)([O-]).
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.
Name types
- USAN - United States Adopted Name
- VAN - CAS valid ambiguous name
- DOT Name - Department of Transportation Name
- Brand Name
6th C.I.
7th C.I.
8th C.I.
9th C.I.
Belgian Name
Czech Name
Dutch Name
French Name
German Name
Hindustan Name
INN:BAN
Italian Name
Japanese Name
Persian Name
Polish Name
Portuguese Name
Roumanian Name
Russian Name
Spanish Name
Swedish Name
Chemical Name - not in one of the other categories or unknown type
