protopseudohypericin

Protopseudohypericin, a naturally occurring naphthodianthrone, is isolated from H. perforatum. Protopseudohypericin is considered to be the biosynthetic precursor of Pseudohypericin[1][2].

[1] Karioti A, et, al. Hypericins as potential leads for new therapeutics. Int J Mol Sci. 2010 Feb 4;11(2):562-94. DOI:10.3390/ijms11020562
[2] Baugh SF, et, al. Simultaneous determination of protopseudohypericin, pseudohypericin, protohypericin, and hypericin without light exposure. J AOAC Int. Nov-Dec 2005;88(6):1607-12. PMID:16526439