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Reconstructed HPLC-HRMS ion chromatograms (m/z 534.28501) from an isopropyl alcohol extract of I. muelleri herbarium specimens: (A) PERTH 7842244 (year collected, 2006) and (B) PERTH 3640787 (year collected, 1979). Peak 1, 6,7-Dehydro-11-hydroxy-12,13-epoxyterpendole A (tR=24.7) and Peak 2, 6,7-Dehydro-terpendole A (tR=27.0).
