diff --git a/docs/source/guide/contribute.rst b/docs/source/guide/contribute.rst
index 69a1446..7523692 100644
--- a/docs/source/guide/contribute.rst
+++ b/docs/source/guide/contribute.rst
@@ -18,6 +18,7 @@ Contributors
 - |ghi| `llazzaro <https://github.com/llazzaro>`_ (Leonardo Lazzaro)
 - |ghi| `bjodah <https://github.com/bjodah>`_ (Björn Dahlgren)
 - |ghi| `RickardSjogren <https://github.com/RickardSjogren>`_ (Rickard Sjögren)
+- |ghi| `Hyeansung <https://github.com/Hyeansung>`_ (Kim, Hyeonsung)
 
 .. _`source code`: https://github.com/mcs07/PubChemPy
 .. _`Issue Tracker`: https://github.com/mcs07/PubChemPy/issues
diff --git a/pubchempy.py b/pubchempy.py
index 8de112f..c2656f3 100644
--- a/pubchempy.py
+++ b/pubchempy.py
@@ -1113,10 +1113,16 @@ def standardized_cid(self):
 
         May not exist if this Substance was not standardizable.
         """
+        """
+        Some substances of pubchem data doesnot provide compound key
         for c in self.record['compound']:
             if c['id']['type'] == CompoundIdType.STANDARDIZED:
                 return c['id']['id']['cid']
-
+        """
+        if 'compound' in self.record:
+            for c in self.record['compound']:
+                if c['id']['type'] == CompoundIdType.STANDARDIZED:
+                    return c['id']['id']['cid']
     @memoized_property
     def standardized_compound(self):
         """Return the :class:`~pubchempy.Compound` that was produced when this Substance was standardized.