Figure 1.
Structures of erubescensoic acid (1), SPF-3059-26 (2), erubescenschromone B (3), penialidin D (4), and 7-hydroxy-6-methoxy-4-oxo-3-[(1E)-3-oxobut-1-en-1-yl]-4H-chromen-5-carboxylic acid (5).
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