Given an assay key, prepare for download a file containing an assay data table in the selected format. See the assay query section of the PUG service documentation (http://pubchem.ncbi.nlm.nih.gov/pug/pughelp.html) for more detail on the supported formats. Compression is optional and defaults to gzip (.gz). Returns a download key. Asynchronous. Given a list key, prepare for download a file containing those records in the selected format. See the web download service documentation (http://pubchem.ncbi.nlm.nih.gov/pc_fetch/pc_fetch-help.html) for more detail on the supported formats and file types. Returns a download key. Asynchronous. Get the description of column (readout) in a BioAssay, which may be the outcome, score, or a TID from the given AID. Synchronous. Get the description of all columns (readouts) in a BioAssay. Synchronous. Get the descriptive information for a BioAssay, including the number of user-specified readouts (TIDs) and whether a score readout is present. Optionally get version information. Synchronous. Given a download key, return an FTP URL that may be used to download the requested file. Synchronous. Given a list key, return an Entrez history key (db, query key, and WebEnv) corresponding to that list. Synchronous. Given an Entrez history key (db, query key, and WebEnv), return an HTTP URL that may be used to view the list in Entrez. Synchronous. Given a list key, return the identifiers as an array of integers. Synchronous. Return the number of IDs in the set represented by the given list key. Synchronous. Given a key for any asynchronous operation, return the status of that operation. Possible return values are: Success, the operation completed normally; HitLimit, TimeLimit: the operation finished normally, but one of the limits was reached (e.g. before the entire database was searched); ServerError, InputError, DataError, Stopped: there was a problem with the input or on the server, and the job has died; Queued: the operation is waiting its turn in the public queue; Running: the operation is in progress. Synchronous. Given a structure key that has been processed by Standardize, return the corresponding PubChem Compound database CID, or an empty value if the structure is not present in PubChem. Synchronous. Given a structure key that has been processed by Standardize, return the chemical structure in as SMILES or InChI strings. Synchronous. Given a structure key that has been processed by Standardize, return the chemical structure as ASN, XML, or SDF, returned as a Base64-encoded string. Synchronous. Given a key for any asynchronous operation, return any system messages (error messages, job info, etc.) associated with the operation, if any. Synchronous. Search PubChem Compound for structures identical to the one given by the structure key input, based on a user-selected level of chemical identity: connectivity only, match isotopes and/or stereo, etc. The search may be limited by elapsed time or number of records found, or restricted to search only within a previous result set (given by a list key). Returns a list key. Asynchronous. Specify an assay table from a BioAssay AID. The table may be complete, concise, or include a ListKey-specified set of readouts (TIDs). By default, all tested substances are included, but can be restricted to a ListKey-specified set of SIDs or CIDs. Returns an assay key. Synchronous. Input an Entrez history key (db, query key, and WebEnv). Returns a list key. Synchronous. Input a set of identifiers for a PubChem database, as an array of integers. Returns a list key. Synchronous. Input a set of identifiers for a PubChem database, as a simple string of integer values separated by commas and/or whitespace. Returns a list key. Synchronous. Input a chemical structure as a simple (one-line) string, either SMILES or InChI. Returns a structure key. Synchronous. Input a chemical structure in ASN.1 (text or binary), XML, or SDF format. The structure must be encoded as a Base64 string. Currently only single structures are supported. Returns a structure key. Synchronous. Search PubChem Compound for structures of a given molecular formula, optionally allowing elements not specified to be present. The search may be limited by elapsed time or number of records found, or restricted to search only within a previous result set (given by a list key). Returns a list key. Asynchronous. Compute a matrix of scores from one or two lists of IDs (if one, the IDs will be self-scored), of the selected type and in the selected format. Compression is optional and defaults to gzip (.gz). Returns a download key. Asynchronous. Search PubChem Compound for structures similar to the one given by the structure key input, based on the given Tanimoto-based similarity score. The search may be limited by elapsed time or number of records found, or restricted to search only within a previous result set (given by a list key). Returns a list key. Asynchronous. Standardize the structure given by the structure key input, using the same algorithm PubChem uses to construct the Compound database. Returns a structure key. Asynchronous. Search PubChem Compound for structures containing the one given by the structure key input, based on a user-selected level of chemical identity: connectivity only, match isotopes and/or stereo, etc. The search may be limited by elapsed time or number of records found, or restricted to search only within a previous result set (given by a list key). Returns a list key. Asynchronous. Search PubChem Compound for structures contained within the one given by the structure key input, based on a user-selected level of chemical identity: connectivity only, match isotopes and/or stereo, etc. The search may be limited by elapsed time or number of records found, or restricted to search only within a previous result set (given by a list key). Returns a list key. Asynchronous.