Non-consistent behaviour "nicotinic acid"

[LLCampos]

When I run:

bash get_entities.sh "nicotinic acid-adenine nicotinic acid" ChEBI

I get:

0   14  nicotinic acid
23  37  nicotinic acid

The nicotinic acid in nicotinic acid-adenin is matched. But when I run just:

bash get_entities.sh "nicotinic acid-adenine" ChEBI

I get nothing, which is an expected behavior. So, the output of the first command should be:

23  37  nicotinic acid