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nih.gov
pubmed.ncbi.nlm.nih.gov
Yang, H; Protiva, P; Cui, B; Ma, C; Baggett, S; Hequet, V; Mori, S; Weinstein, IB; Kennelly, EJ (2003). "New bioactive polyphenols from Theobroma grandiflorum ("cupuaçu")". Journal of Natural Products. 66 (11): 1501–4. doi:10.1021/np034002j. PMID14640528.