3'-O-Methylbatatasin III is a natural compound from the orchid plant Bletilla splendens with antibiotic activity and antispasmodic activity.

Methyl 3-O-methylgallate is a rare natural product that showed promising antioxidant activities.

5-Hydroxyindoleacetic acid (5HIAA) is a breakdown product of serotonin that is excreted in the urine. Serotonin and 5HIAA are produced in excess amounts by carcinoid tumors and levels of these substances may be measured in the urine to test for carcinoid tumors (NCI).