All open (March 2012 Release) 273885 compounds. 64 MB compressed, uncompresses to 648 MB
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. 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. 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.