diff --git a/src/nomad_catalysis/schema_packages/catalysis.py b/src/nomad_catalysis/schema_packages/catalysis.py
index 6c48fdf..ef4b739 100644
--- a/src/nomad_catalysis/schema_packages/catalysis.py
+++ b/src/nomad_catalysis/schema_packages/catalysis.py
@@ -716,15 +716,17 @@ def normalize(self, archive, logger):
         elif '_' in self.name:
             self.name = self.name.replace('_', ' ')
 
-        if self.name and self.pure_component is None:
-            import time
-
+        if self.name and (
+            self.pure_component is None or self.pure_component.iupac_name is None
+        ):
             pure_component = self.update_chemical_info()
             self.pure_component = pure_component
 
             if self.pure_component.iupac_name is not None:
                 return
             else:
+                import time
+
                 time.sleep(1)
                 self.pure_component.normalize(archive, logger)
 
diff --git a/src/nomad_catalysis/schema_packages/chemical_data.py b/src/nomad_catalysis/schema_packages/chemical_data.py
index edbf1d4..a150e8d 100644
--- a/src/nomad_catalysis/schema_packages/chemical_data.py
+++ b/src/nomad_catalysis/schema_packages/chemical_data.py
@@ -3,7 +3,7 @@
         'pub_chem_id': 281,
         'iupac_name': 'carbon monoxide',
         'molecular_formula': 'CO',
-        'molecular_mass': 28.01,
+        'molar_mass': 28.01,
         'inchi': 'InChI=1S/CO/c1-2',
         'inchi_key': 'UGFAIRIUMAVXCW-UHFFFAOYSA-N',
         'cas_number': '630-08-0',
@@ -13,7 +13,7 @@
         'pub_chem_id': 280,
         'iupac_name': 'carbon dioxide',
         'molecular_formula': 'CO2',
-        'molecular_mass': 44.01,
+        'molar_mass': 44.01,
         'inchi': 'InChI=1S/CO2/c2-1-3',
         'inchi_key': 'CURLTUGMZLYLDI-UHFFFAOYSA-N',
         'cas_number': '124-38-9',
@@ -23,14 +23,14 @@
         'pub_chem_id': 1032,
         'iupac_name': 'propanoic acid',
         'molecular_formula': 'C3H6O2',
-        'molecular_mass': 74.08,
+        'molar_mass': 74.08,
     },
     'propionic acid': 'propanoic acid',  # Reference to 'propanoic acid'
     'ammonia': {
         'pub_chem_id': 222,
         'iupac_name': 'ammonia',  # actually 'azane'
         'molecular_formula': 'H3N',
-        'molecular_mass': 17.03,
+        'molar_mass': 17.03,
         'inchi': 'InChI=1S/H3N/h1H3',
         'inchi_key': 'QGZKDVFQNNGYKY-UHFFFAOYSA-N',
         'cas_number': '7664-41-7',
@@ -40,7 +40,7 @@
         'pub_chem_id': 783,
         'iupac_name': 'molecular hydrogen',
         'molecular_formula': 'H2',
-        'molecular_mass': 2.016,
+        'molar_mass': 2.016,
         'inchi': 'InChI=1S/H2/h1H',
         'inchi_key': 'UFHFLCQGNIYNRP-UHFFFAOYSA-N',
         'cas_number': '1333-74-0',
@@ -51,7 +51,7 @@
         'pub_chem_id': 962,
         'iupac_name': 'water',  # actually 'oxidane'
         'molecular_formula': 'H2O',
-        'molecular_mass': 18.015,
+        'molar_mass': 18.015,
         'inchi': 'InChI=1S/H2O/h1H2',
     },
     'H2O': 'water',  # Reference to 'water'
@@ -59,7 +59,7 @@
         'pub_chem_id': 23968,
         'iupac_name': 'argon',
         'molecular_formula': 'Ar',
-        'molecular_mass': 39.9,
+        'molar_mass': 39.9,
         'inchi': 'InChI=1S/Ar',
         'inchi_key': 'XKRFYHLGVUSROY-UHFFFAOYSA-N',
         'cas_number': '7440-37-1',
@@ -69,7 +69,7 @@
         'pub_chem_id': 947,
         'iupac_name': 'molecular nitrogen',
         'molecular_formula': 'N2',
-        'molecular_mass': 28.014,
+        'molar_mass': 28.014,
         'inchi': 'InChI=1S/N2/c1-2',
         'inchi_key': 'IJGRMHOSHXDMSA-UHFFFAOYSA-N',
         'cas_number': '7727-37-9',
@@ -80,7 +80,7 @@
         'pub_chem_id': 977,
         'iupac_name': 'molecular oxygen',
         'molecular_formula': 'O2',
-        'molecular_mass': 32.00,
+        'molar_mass': 32.00,
         'inchi': 'InChI=1S/O2/c1-2',
         'inchi_key': 'MYMOFIZGZYHOMD-UHFFFAOYSA-N',
         'cas_number': '7782-44-7',
@@ -91,7 +91,7 @@
         'pub_chem_id': 297,
         'iupac_name': 'methane',
         'molecular_formula': 'CH4',
-        'molecular_mass': 16.043,
+        'molar_mass': 16.043,
         'inchi': 'InChI=1S/CH4/h1H4',
         'inchi_key': 'VNWKTOKETHGBQD-UHFFFAOYSA-N',
         'cas_number': '74-82-8',
@@ -101,7 +101,7 @@
         'pub_chem_id': 6324,
         'iupac_name': 'ethane',
         'molecular_formula': 'C2H6',
-        'molecular_mass': 30.07,
+        'molar_mass': 30.07,
         'inchi': 'InChI=1S/C2H6/c1-2/h1-2H3',
         'inchi_key': 'OTMSDBZUPAUEDD-UHFFFAOYSA-N',
         'cas_number': '74-84-0',
@@ -111,7 +111,7 @@
         'pub_chem_id': 6325,
         'iupac_name': 'ethene',
         'molecular_formula': 'C2H4',
-        'molecular_mass': 28.05,
+        'molar_mass': 28.05,
         'inchi': 'InChI=1S/C2H4/c1-2/h1-2H2',
         'inchi_key': 'VGGSQFUCUMXWEO-UHFFFAOYSA-N',
         'cas_number': '74-85-1',
@@ -122,7 +122,7 @@
         'pub_chem_id': 6326,
         'iupac_name': 'ethyne',
         'molecular_formula': 'C2H2',
-        'molecular_mass': 26.04,
+        'molar_mass': 26.04,
         'inchi': 'InChI=1S/C2H2/c1-2/h1-2H',
         'inchi_key': 'HSFWRNGVRCDJHI-UHFFFAOYSA-N',
         'cas_number': '74-86-2',
@@ -134,16 +134,17 @@
         'pub_chem_id': 176,
         'iupac_name': 'acetic acid',
         'molecular_formula': 'C2H4O2',
-        'molecular_mass': 60.05,
+        'molar_mass': 60.05,
         'inchi': 'InChI=1S/C2H4O2/c1-2(3)4/h1H3,(H,3,4)',
         'inchi_key': 'QTBSBXVTEAMEQO-UHFFFAOYSA-N',
         'cas_number': '64-19-7',
     },
+    'aceticacid': 'acetic acid',  # Reference to 'acetic acid'
     'propane': {
         'pub_chem_id': 6334,
         'iupac_name': 'propane',
         'molecular_formula': 'C3H8',
-        'molecular_mass': 44.10,
+        'molar_mass': 44.10,
         'inchi': 'InChI=1S/C3H8/c1-3-2/h3H2,1-2H3',
         'inchi_key': 'ATUOYWHBWRKTHZ-UHFFFAOYSA-N',
         'cas_number': '74-98-6',
@@ -153,7 +154,7 @@
         'pub_chem_id': 8252,
         'iupac_name': 'prop-1-ene',
         'molecular_formula': 'C3H6',
-        'molecular_mass': 42.08,
+        'molar_mass': 42.08,
         'inchi': 'InChI=1S/C3H6/c1-3-2/h3H,1H2,2H3',
         'cas_number': '115-07-1',
     },
@@ -163,7 +164,7 @@
         'pub_chem_id': 6335,
         'iupac_name': 'propyne',
         'molecular_formula': 'C3H4',
-        'molecular_mass': 40.06,
+        'molar_mass': 40.06,
         'inchi': 'InChI=1S/C3H4/c1-3-2/h1H,3H2',
     },
     'propine': 'propyne',  # Reference to 'propyne'
@@ -172,7 +173,7 @@
         'pub_chem_id': 6581,
         'iupac_name': 'prop-2-enoic acid',
         'molecular_formula': 'C3H4O2',
-        'molecular_mass': 72.06,
+        'molar_mass': 72.06,
         'inchi': 'InChI=1S/C3H4O2/c1-2-3(4)5/h2H,1H2,(H,4,5)',
         'inchi_key': 'NIXOWILDQLNWCW-UHFFFAOYSA-N',
         'cas_number': '79-10-7',
@@ -182,7 +183,7 @@
         'pub_chem_id': 177,
         'iupac_name': 'acetaldehyde',
         'molecular_formula': 'C2H4O',
-        'molecular_mass': 44.05,
+        'molar_mass': 44.05,
         'inchi': 'InChI=1S/C2H4O/c1-2-3/h2H,1H3',
         'inchi_key': 'IKHGUXGNUITLKF-UHFFFAOYSA-N',
         'cas_number': '75-07-0',
@@ -191,17 +192,25 @@
         'pub_chem_id': 7843,
         'iupac_name': 'butane',
         'molecular_formula': 'C4H10',
-        'molecular_mass': 58.12,
+        'molar_mass': 58.12,
         'inchi': 'InChI=1S/C4H10/c1-3-4-2/h3-4H2,1-2H3',
         'inchi_key': 'KDXKERNSBIXSRK-UHFFFAOYSA-N',
         'cas_number': '106-97-8',
     },
     'n-butane': 'butane',  # Reference to 'butane'
+    'nbutane': 'butane',  # Reference to 'butane'
+    '2-methylpropane': {
+        'pub_chem_id': 6360,
+        'iupac_name': '2-methylpropane',
+        'molecular_formula': 'C4H10',
+        'molar_mass': 58.12,
+    },
+    'isobutane': '2-methylpropane',
     'ethanol': {
         'pub_chem_id': 702,
         'iupac_name': 'ethanol',
         'molecular_formula': 'C2H6O',
-        'molecular_mass': 46.07,
+        'molar_mass': 46.07,
         'inchi': 'InChI=1S/C2H6O/c1-2-3/h3H,2H2,1H3',
         'inchi_key': 'LFQSCWFLJHTTHZ-UHFFFAOYSA-N',
         'cas_number': '64-17-5',
@@ -212,7 +221,7 @@
         'pub_chem_id': 887,
         'iupac_name': 'methanol',
         'molecular_formula': 'CH4O',
-        'molecular_mass': 32.04,
+        'molar_mass': 32.04,
         'inchi': 'InChI=1S/CH4O/c1-2/h2H,1H3',
         'inchi_key': 'OKKJLVBELUTLKV-UHFFFAOYSA-N',
         'cas_number': '67-56-1',
@@ -224,7 +233,7 @@
         'pub_chem_id': 284,
         'iupac_name': 'formic acid',
         'molecular_formula': 'CH2O2',
-        'molecular_mass': 46.03,
+        'molar_mass': 46.03,
         'inchi': 'InChI=1S/CH2O2/c2-1-3/h1H,(H,2,3)',
         'inchi_key': 'BDAGIHXWWSANSR-UHFFFAOYSA-N',
         'cas_number': '64-18-6',
@@ -235,7 +244,7 @@
         'pub_chem_id': 7847,
         'iupac_name': 'prop-2-enal',
         'molecular_formula': 'C3H4O',
-        'molecular_mass': 56.06,
+        'molar_mass': 56.06,
         'inchi': 'InChI=1S/C3H4O/c1-2-3-4/h2-3H,1H2',
     },
     'acrolein': 'prop-2-enal',  # Reference to 'prop-2-enal'
@@ -244,7 +253,7 @@
         'pub_chem_id': 527,
         'iupac_name': 'propanal',
         'molecular_formula': 'C3H6O',
-        'molecular_mass': 58.08,
+        'molar_mass': 58.08,
         'inchi': 'InChI=1S/C3H6O/c1-2-3-4/h3H,2H,1H3',
     },
     'propionaldehyde': 'propanal',  # Reference to 'propanal'
@@ -252,7 +261,7 @@
         'pub_chem_id': 180,
         'iupac_name': 'propan-2-one',
         'molecular_formula': 'C3H6O',
-        'molecular_mass': 58.08,
+        'molar_mass': 58.08,
         'inchi': 'InChI=1S/C3H6O/c1-3(2)2/h1-2H3',
         'inchi_key': 'CSCPPACGZOOCGX-UHFFFAOYSA-N',
         'cas_number': '67-64-1',
@@ -262,7 +271,7 @@
         'pub_chem_id': 3776,
         'iupac_name': 'propan-2-ol',
         'molecular_formula': 'C3H8O',
-        'molecular_mass': 60.10,
+        'molar_mass': 60.10,
         'inchi': 'InChI=1S/C3H8O/c1-3(2)4/h3-4H,1-2H3',
         'inchi_key': 'KZBMWSRVAYFASW-UHFFFAOYSA-N',
         'cas_number': '67-63-0',
@@ -273,7 +282,7 @@
         'pub_chem_id': 7858,
         'iupac_name': 'prop-2-en-1-ol',
         'molecular_formula': 'C3H6O',
-        'molecular_mass': 58.08,
+        'molar_mass': 58.08,
         'inchi': 'InChI=1S/C3H6O/c1-2-3-4/h2,4H,1,3H2',
         'inchi_key': 'QWVGKYWNOKOFNN-UHFFFAOYSA-N',
         'cas_number': '107-18-6',
@@ -283,7 +292,7 @@
         'pub_chem_id': 1031,
         'iupac_name': 'propan-1-ol',
         'molecular_formula': 'C3H8O',
-        'molecular_mass': 60.10,
+        'molar_mass': 60.10,
         'inchi': 'InChI=1S/C3H8O/c1-2-3-4/h4H,2-3H2,1H3',
         'inchi_key': 'XNWBBONJTDVZCF-UHFFFAOYSA-N',
         'cas_number': '71-23-8',
@@ -294,16 +303,16 @@
         'pub_chem_id': 7844,
         'iupac_name': 'but-1-ene',
         'molecular_formula': 'C4H8',
-        'molecular_mass': 56.11,
+        'molar_mass': 56.11,
         'inchi': 'InChI=1S/C4H8/c1-3-4-2/h3H,1,4H2,2H3',
     },
     'butylene': '1-butene',  # Reference to '1-butene'
     'n-Butene': '1-butene',  # Reference to '1-butene'
-    '' 'furan': {
+    'furan': {
         'pub_chem_id': 8029,
         'iupac_name': 'furan',
         'molecular_formula': 'C4H4O',
-        'molecular_mass': 68.07,
+        'molar_mass': 68.07,
         'inchi': 'InChI=1S/C4H4O/c1-2-4-5-3-1/h1-4H',
         'inchi_key': 'NNTHXFGICWXRPZ-UHFFFAOYSA-N',
         'cas_number': '110-00-9',
@@ -313,7 +322,7 @@
         'pub_chem_id': 7923,
         'iupac_name': 'furan-2,5-dione',
         'molecular_formula': 'C4H2O3',
-        'molecular_mass': 98.06,
+        'molar_mass': 98.06,
         'inchi': 'InChI=1S/C4H2O3/c5-3-1-2-4(6)7-3/h1-2H',
     },
     'maleic anhydride': 'furan-2,5-dione',  # Reference to 'furan-2,5-dione'