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HPLC-MS-analysis of S. 24-punctata pupal secretion, taken from 2- to 4-day-old pupae. (A) Total ion current (TIC) chromatogram. (B) Ion chromatograms for the pseudo molecular ions (M+H)+ of dimers 11–13 and their isomers 14–17. (C) Ion chromatograms for the doubly charged pseudo molecular ions (M+2H)++ of dimers 11–13. Note that later eluting dimers 14–17 do not show doubly charged ions. (D) Ion chromatograms for the pseudo molecular ions (M+H)+ of trimers 18–21.
