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A bioactivity guided program exploring the interaction of phytochemicals in the entire plant  Primula macrocalyx  with the organic anion transporters (OAT1 and OAT3) and microorganisms led to the elucidation of ten known flavones ( 1 – 4 ,  6 – 10 ,  12 ) and two previously undescribed flavones ( 5 ,  11 ). The structures of the compounds were determined by extensive analysis of spectroscopic data, as well as by comparison with data from previous reports. Two known flavones ( 9 ,  12 ) are reported for the first time from the family Primulaceae. All compounds were evaluated for inhibition of OAT1 and OAT3. Six flavones ( 2 ,  3 ,  6 – 8 ,  12 ) showed potent inhibitory activity on OAT1, while seven flavones ( 2 ,  3 ,  6 – 9 ,  12 ) showed marked inhibitory activity on OAT3, with IC 50  ≤ 10.0  µ M. Antimicrobial activities of crude fractions against sixteen microorganisms were tested to give a target yeast strain  Candida rugosa  for further evaluation of MICs on the isolates. Three flavones ( 7 ,  8 ,  12 ) showed marked antifungal activity with MIC < 2.0  µ M. To our knowledge, this study is the first to evaluate these flavones as inhibitors of the OAT1 and OAT3, and as antifungal agents.

Unusual Flavones from Primula macrocalyx as Inhibitors of OAT1 and OAT3 and as Antifungal Agents against Candida rugosa