This test checks for labels of ammonia data nodes which can use Unicode.
For a ammonia data node the label NH3 is used, but the chemically more correct Unicode version NH₃ can be used.
Open the pathway and replace the NH3 label with a NH₃ label.
IMPORTANT: PathVisio 3.3 currently does not display Unicode characters correctly in the main view, but it can still be used to edit the labels. After uploading, the classic and the new website will display the Unicode label correctly.