It seems that the ID conversion web server is not working since this Sunday
How to reproduce?
Giving the “example” compound names to the query field, and choosing the input type as common names (default) doesn’t return any match.
1,3-Diaminopropane
2-Ketobutyric acid
2-Hydroxybutyric acid
2-Methoxyestrone
(R)-3-Hydroxybutyric acid
Could you check that, please?