Tuberculatin is a lignin. Tuberculatin can be isolated from Justicia ciliata[1].
References
[1] Yi-Huang Lu, et al. DNA strand-scission by phloroglucinols and lignans from heartwood of Garcinia subelliptica Merr. and Justicia plants. Phytochemistry. 2008 Jan;69(1):225-33. DOI:10.1016/j.phytochem.2007.06.026
