diff --git a/deepsearch/chemistry/__init__.py b/deepsearch/chemistry/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/deepsearch/chemistry/queries/__init__.py b/deepsearch/chemistry/queries/__init__.py
new file mode 100644
index 00000000..e69de29b
diff --git a/deepsearch/chemistry/queries/molecules.py b/deepsearch/chemistry/queries/molecules.py
new file mode 100644
index 00000000..21cc3e04
--- /dev/null
+++ b/deepsearch/chemistry/queries/molecules.py
@@ -0,0 +1,160 @@
+from enum import Enum
+from typing import List, Union
+
+from pydantic import BaseModel
+
+from deepsearch.cps.client.queries import Query
+
+from ..resources import ChemVecDbResource, KnowledgeDbResource
+
+
+class MolQueryType(str, Enum):
+    SIMILARITY = "similarity"
+    SUBSTRUCTURE = "substructure"
+
+
+class MolQueryLang(str, Enum):
+    SMILES = "smiles"
+    SMARTS = "smarts"
+
+
+class MolIdType(str, Enum):
+    SMILES = "smiles"
+    SMARTS = "smarts"
+    INCHI = "inchi"
+    INCHIKEY = "inchikey"
+
+
+class MolId(BaseModel):
+    type: MolIdType
+    value: str
+
+
+CHEMVECDB_COLLECTIONS = {
+    MolQueryType.SIMILARITY: "patcid_tanimoto",
+    MolQueryType.SUBSTRUCTURE: "patcid_substructure",
+}
+
+
+def MoleculeQuery(
+    query: str,
+    query_type: MolQueryType,
+    query_lang: MolQueryLang = MolQueryLang.SMILES,
+    num_items: int = 10,
+) -> Query:
+    """
+    Use the vector database in Deep Search for querying molecules
+    by substructure or similarity.
+    The result is contained in the `molecules` output of the response.
+    """
+
+    mol_query = Query()
+    vec_search_task = mol_query.add(
+        "ChemVec",
+        task_id="vec_search",
+        parameters={
+            "query_type": query_type,
+            "query_lang": query_lang,
+            "coll_name": CHEMVECDB_COLLECTIONS[query_type],
+            "query": query,
+            "topk": num_items,
+        },
+        coordinates=ChemVecDbResource(),
+    )
+
+    projection_task = mol_query.add(
+        "Projection",
+        task_id="projection",
+        parameters={
+            "projections": {
+                "nodes": {"field_path": ["$$map", "id"]},
+            }
+        },
+        inputs={"nodes": vec_search_task.output("compounds")},
+    )
+
+    lookup_task = mol_query.add(
+        "DbSubject",
+        task_id="db_lookup",
+        parameters={
+            "identifiers": {
+                "persistent_identifiers": {"#Input": {"db_lookup": "nodes"}}
+            },
+            "limit": num_items,
+        },
+        inputs={"nodes": projection_task.output("nodes")},
+        coordinates=KnowledgeDbResource(),
+    )
+
+    lookup_task.output("subjects").output_as("molecules")
+
+    return mol_query
+
+
+def MoleculesInPatentsQuery(
+    patents: Union[str, List[str]],
+    num_items: int = 10,
+) -> Query:
+    """
+    List all molecules contained in a list of patents.
+    The result is contained in the `molecules` output of the response.
+    """
+
+    if isinstance(patents, str):
+        patents = [patents]
+
+    mol_query = Query()
+    lookup_task = mol_query.add(
+        "DbSubject",
+        task_id="db_lookup",
+        parameters={
+            "references": {
+                "identifiers": [
+                    {
+                        "type": "patentid",
+                        "value": v,
+                    }
+                    for v in patents
+                ]
+            },
+            "limit": num_items,
+        },
+        coordinates=KnowledgeDbResource(),
+    )
+
+    lookup_task.output("subjects").output_as("molecules")
+
+    return mol_query
+
+
+def PatentsWithMoleculesQuery(
+    molecules: List[MolId],
+    num_items: int = 10,
+) -> Query:
+    """
+    List all patents containing any of the input molecules.
+    The result is contained in the `patents` output of the response.
+    """
+
+    doc_query = Query()
+    lookup_task = doc_query.add(
+        "DbDocument",
+        task_id="db_lookup",
+        parameters={
+            "subjects": {
+                "identifiers": [
+                    {
+                        "type": item.type.value,
+                        "value": item.value,
+                    }
+                    for item in molecules
+                ]
+            },
+            "limit": num_items,
+        },
+        coordinates=KnowledgeDbResource(),
+    )
+
+    lookup_task.output("documents").output_as("patents")
+
+    return doc_query
diff --git a/deepsearch/chemistry/resources.py b/deepsearch/chemistry/resources.py
new file mode 100644
index 00000000..51819afa
--- /dev/null
+++ b/deepsearch/chemistry/resources.py
@@ -0,0 +1,8 @@
+class ChemVecDbResource:
+    def to_resource(self):
+        return {"type": "dsvecdb", "instance_id": "chem_vecdb"}
+
+
+class KnowledgeDbResource:
+    def to_resource(self):
+        return {"type": "db", "instance_id": "knowledge_db"}