def standardized_compound(self):
        """Return the :class:`~pubchempy.Compound` that was produced when this Substance was standardized.

        Requires an extra request. Result is cached.
        """
        for c in self.record['compound']:
            if c['id']['type'] == CompoundIdType.STANDARDIZED:
                return Compound.from_cid(c['id']['id']['cid'])
Return the :class:`~pubchempy.Compound` that was produced when this Substance was standardized.

        Requires an extra request. Result is cached.