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Control cladode (MeOH 4%, v/v) (a), necrotic areas produced by (−)-(R)-mellein (1), (±)-botryoisocoumarin A (2), (−)-(3R,4R)-4-hydroxymellein (3), (−)-(3R,4S)-4-hydroxymellein (4), (−)-terpestacin (5), and (+)-neoisocoumarin (6) on cladodes of cactus pear.
