Higher accumulation of mitragynine in Mitragyna speciosa (kratom) leaves affected by insect attack.

Conversely, the presence of 8-hydroxy-8-(3-octyloxiran-2-yl) octanoic acid and 2,3,5,7-tetramethoxy-9,10-dihydrophenanthrene was significantly higher in the non-insect samples, with 2,3,5,7-tetramethoxy-9,10-dihydrophenanthrene showing a highly significant presence ( P-value < 0.01).

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