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Catalponol is a naphthoquinone derivative. Catalponol enhances dopamine biosynthesis by inducing tyrosine hydroxylase activity. Catalponol also increases the levels of cAMP and tyrosine hydroxylase phosphorylation in PC12 cells[1][2].

[1] Hai-Shan Huang, et al. Catalponol enhances dopamine biosynthesis and protects against L-DOPA-induced cytotoxicity in PC12 cells. J Asian Nat Prod Res. 2009 Oct;11(10):867-75. DOI:10.1080/10286020903193094
[2] Byeong Min Park, et al. Naphthoquinones from Catalpa ovata and their inhibitory effects on the production of nitric oxide. Arch Pharm Res. 2010 Mar;33(3):381-5. DOI:10.1007/s12272-010-0306-2