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Politi, M., Peschel, W., Wilson, N.D., Zloh, M., Prieto-Garcia, J.M. and Heinrich, M. (2008) Direct NMR analysis of cannabis water extracts and tinctures and semi-quantitative data on delta9-THC and delta9-THC-acid. Phytochemistry Reviews, 69 (2). pp. 562-570. 10.1016/j.phytochem.2007.07.018.