If the molecule itself is not patentable, the process of efficient extraction or synthesis may be. So, if somebody can come up with it, they may have a thriving business.

The substance in question is a peptide. It's not something you simply extract from a plant using a solvent. OTOH, being a peptide, it's likely easy enough to produce in a genetically engineered bacterium or yeast. Efficient extraction may remain a problem though, because you'll need to select a particular protein fragment (the peptide) from reams of other protein fragments of the bacterial / fungal cells you process.