The chemical substance names described in the patent publications have various descriptions and the description of the name depends on the author. Such variation causes hindering information sharing. Auto-extraction of chemical substance names is useful for information sharing. In order to extract the names of chemical substances in Japanese, we created a corpus tagged with chemical substance names. Next, we studied cutting out words from sentences, concatenating cut-out words and taking out only chemical substance names from cut-out words. We also made a selection comparison between chemical substance names and functional group names that are similar to chemical substance names.