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).