Resources

A resource is the type of thing you are asking about, such as substance, catalog, gene, etc. Resources are written as plurals in the URL, indicating that the result is always a selection from among them. Each ZINC15 URL begins with a resource. A second resource may be specified later in the URL, as may constraints derived from other resources. There are nearly 20 resources in ZINC15 already (see below), but we do not expect the find total to exceed 40. The URL syntax here covers both the web pages and the API. We currently support the following resources:

Resource	Is a set of	Approximate Number	Example use of this resource when the answer to your question is: a) a list of these things b) one of these things, or c) things derived from a single one of these things.
substances	molecules	200,000,000	a) purchasable compounds [1] b) ZINC ID 53 [2] c) All genes hit by compound ZINC597013 [3]
catalogs	vendor and annotated catalogs	400	a) catalogs whose members are biogenic (but see also endogenous, metabolite) [4] b) The ChEMBL20 catalog [5] c) Items in the DrugBank FDA catalogs [6] Interestingly, this shows clearly when a DrugBank ID has been expanded into multiple ZINC IDs.
genes	UniProt Gene Symbols	2800	a) All Class A GPCR genes [7] b) The BTK gene [8] c) SEA Predicted ligands for 5-HT2A [9]
catitems	What vendors and annotated catalogs call the molecules in their source catalogs	1 billion	a) All molecules where the original supplier code begins with B1234 [10] b) N.B. There is no unique key for supplier codes, so you cannot necessairily select one. The purpose of the catitem code allows you to write queries that originate in another catalog Items in the HMDB database, where the catalog code starts with HMDB1 and the gene it is active against starts with ADR. [11] Compounds sold by Frontier, beginning with B123 and containing a pyridine ring. [12]
protomers	3D representations	6 million and growing	a) Molecules with a charge of minus 2 at pH 7.4. [13] b) One individual representation in 3D SDF format [14] c) Catalogs that this molecule can be found in [15]
targets	UniProt accession codes	3800	a) Information about targets by uniprot code in ZINC as a text file [16] b) Information about the FTO_HUMAN gene. [17] c) Substances annotated to bind FTO_HUMAN [18]
activities	Observed	220,000	a) Individual data points of compound-target associations [19] b) The individual activites are not exposed in a way you can see. c) All activities better than 1 nM [20]
clusterreps	Cluster representatives	3900	about chemical diversity of ligands for genes
clusters	Clustered compounds by gene	220,000	about compounds for genes organized by chemotype.
majorclasses	Major classes	15	a) A list of major classes [21] b) The membrane_receptor major class [22] c) genes in the enzyme major class [23] Another examples: substances in the genes in the major class of ion channels [24]
subclasses	Subclasses	44	a) A list of subclasses http://zinc15.docking.org/subclasses] b) The GPCR-A subclass [25] c) The substances that bind the GPCR F subclass [26]
organisms	asdf asdf	5	a) List of supported organisms [27] b) not supported c) not supported
tools	asdf asdf	10,000	a) List of tool compounds [28] b) Tool compound number 100 [29] c) Tool compounds for GPCR-A targets [30]
ecfp4s	lala	100,000,000	a) List of fingerprints [31] b) Fingerprint for ZINC53 [32] c) Fingerprints for all ligands for MR [33]
predictions	SEA predictions	1 billion	a) List of predictions [34] b) Prediction #1 [35] c) Predictions for ADRB2 [36]
atccodes	atc codes	1500	a) List of ATC codes [37] b) ATC code L01A (cancer) [38] c) something goes here...
generelations	gene_relations	250,000	a) List of gene-gene relations [39] b) Gene relation #1 [40] c) Similar genes by the ligands they bind for OPRK [41] other options are sequence-similarity and coexpression and ppi
observations	obs	280,000	a) List of observations [42] b) Something goes here c) Something goes here too.
patterns	SMARTS patterns	535 patterns, 2.5 M entries	a) List of patterns [43] b) Something here c) Something here
rings	Ring systems	10,000	a) List of rings [44] b) something here c) something here
toolcompounds	Tool compounds	3000	3 chosen, 10 short listed, max, per target a) List of tool compounds [45] b) something goes here c) something here.

There is also a pseudo resource: tranches.

Two resources in development are nplikeness and druglikeness. The others will be announced in due course.

Historical note: In ZINC 12, the reference-table was always substances, and thus the result of any query was always a set of molecules. A few reports such as vendor and target listings were available via the webpages, but were not supported by the API. This is a substantial change that appeared first in ZINC 15.