- Polyisoprenylated benzophenone, garcinol, a natural histone acetyltransferase inhibitor, represses chromatin transcription and alters global gene expression. Balasubramanyam, K., Altaf, M., Varier, R.A., Swaminathan, V., Ravindran, A., Sadhale, P.P., Kundu, T.K. J. Biol. Chem. (2004)