diff --git a/mdagent/tools/base_tools/preprocess_tools/pdb_tools.py b/mdagent/tools/base_tools/preprocess_tools/pdb_tools.py
index e7d2018b..4e562178 100644
--- a/mdagent/tools/base_tools/preprocess_tools/pdb_tools.py
+++ b/mdagent/tools/base_tools/preprocess_tools/pdb_tools.py
@@ -254,8 +254,9 @@ def summarize_errors(errors):
 
 
 class Molecule:
-    def __init__(self, filename, number_of_molecules=1, instructions=None):
+    def __init__(self, filename, file_id, number_of_molecules=1, instructions=None):
         self.filename = filename
+        self.id = file_id
         self.number_of_molecules = number_of_molecules
         self.instructions = instructions if instructions else []
         self.load()
@@ -276,6 +277,7 @@ def __init__(
         self.molecules = []
         self.file_number = 1
         self.file_description = file_description
+        self.final_name = None
 
     def add_molecule(self, molecule):
         self.molecules.append(molecule)
@@ -284,16 +286,33 @@ def add_molecule(self, molecule):
 
     def generate_input_header(self):
         # Generate the header of the input file in .inp format
+        orig_pdbs_ids = [
+            f"{molecule.number_of_molecules + molecule.id}"
+            for molecule in self.molecules
+        ]
+
+        _final_name = f'{"_".join(orig_pdbs_ids)}'
 
-        while os.path.exists(f"packed_structures_v{self.file_number}.pdb"):
+        self.file_description = (
+            "Packed Structures of the following molecules:\n"
+            + "\n".join(
+                [
+                    f"Molecule ID: {molecule.id}, "
+                    f"Number of Molecules: {molecule.number_of_molecules}"
+                    for molecule in self.molecules
+                ]
+            )
+        )
+        while os.path.exists(f"{_final_name}_v{self.file_number}.pdb"):
             self.file_number += 1
 
+        self.final_name = f"{_final_name}_v{self.file_number}.pdb"
         with open("packmol.inp", "w") as out:
             out.write("##Automatically generated by LangChain\n")
             out.write("tolerance 2.0\n")
             out.write("filetype pdb\n")
             out.write(
-                f"output packed_structures_v{self.file_number}.pdb\n"
+                f"output {self.final_name}\n"
             )  # this is the name of the final file
             out.close()
 
@@ -327,19 +346,23 @@ def run_packmol(self, PathRegistry):
                     "Packmol failed to run. Please check the input file and try again."
                 )
 
-        PathRegistry.map_path(
-            f"packed_structures_v{self.file_number}.pdb",
-            f"packed_structures_v{self.file_number}.pdb",
-            self.file_description,
-        )
         # validate final pdb
-        pdb_validation = validate_pdb_format(f"packed_structures{self.file_number}.pdb")
+        pdb_validation = validate_pdb_format(f"{self.file_name}")
         if pdb_validation[0] == 0:
             # delete .inp files
             os.remove("packmol.inp")
             for molecule in self.molecules:
                 os.remove(molecule.filename)
-            return "PDB file validated successfully"
+            # name of packed pdb file
+            time_stamp = PathRegistry.get_timestamp()
+            PathRegistry.map_path(
+                f"PACKED_{time_stamp}",
+                f"{self.final_name}",
+                self.file_description,
+            )
+            # move file to files/pdb
+            os.rename(self.final_name, f"files/pdb/{self.final_name}")
+            return f"PDB file validated successfully. FileID: PACKED_{time_stamp}"
         elif pdb_validation[0] == 1:
             # format pdb_validation[1] list of errors
             errors = summarize_errors(pdb_validation[1])
@@ -356,6 +379,7 @@ def run_packmol(self, PathRegistry):
 def packmol_wrapper(
     PathRegistry,
     pdbfiles: List,
+    files_id: List,
     number_of_molecules: List,
     instructions: List[List],
 ):
@@ -365,10 +389,10 @@ def packmol_wrapper(
     # create a box
     box = PackmolBox()
     # add molecules to the box
-    for pdbfile, number_of_molecules, instructions in zip(
-        pdbfiles, number_of_molecules, instructions
+    for pdbfile, file_id, number_of_molecules, instructions in zip(
+        pdbfiles, files_id, number_of_molecules, instructions
     ):
-        molecule = Molecule(pdbfile, number_of_molecules, instructions)
+        molecule = Molecule(pdbfile, file_id, number_of_molecules, instructions)
         box.add_molecule(molecule)
     # generate input header
     box.generate_input_header()
@@ -441,8 +465,10 @@ def _run(self, **values) -> str:
         except ValidationError as e:
             return str(e)
         error_msg = values.get("error", None)
-        pdbfiles = values.get("pdbfiles_id", [])
-        pdbfiles = [self.path_registry.get_mapped_path(pdbfile) for pdbfile in pdbfiles]
+        pdbfile_ids = values.get("pdbfiles_id", [])
+        pdbfiles = [
+            self.path_registry.get_mapped_path(pdbfile) for pdbfile in pdbfile_ids
+        ]
         pdbfile_names = [pdbfile.split("/")[-1] for pdbfile in pdbfiles]
         # copy them to the current directory with temp_ names
         for pdbfile, pdbfile_name in zip(pdbfiles, pdbfile_names):
@@ -468,6 +494,7 @@ def _run(self, **values) -> str:
         return packmol_wrapper(
             self.path_registry,
             pdbfiles=pdbfile_names,
+            files_id=pdbfile_ids,
             number_of_molecules=number_of_molecules,
             instructions=instructions,
         )