*3.1. General Experimental Procedures*

NMR spectra (Supplementary Materials) were acquired on a Bruker Avance (Bruker, Billerica, MA, USA) 500 or 600 MHz spectrometer with CDCl3 as solvent. Chemical shifts were calibrated to resonances attributed to the residual solvent signal.

EIMS (70 eV) were recorded on an Agilent 5973 mass detector connected to an Agilent 6890 GC equipped with a DB5-MS column (Agilent, Santa Clara, CA, USA, 50 m × 0.2 mm × 0.33 μm) using helium as the carrier gas.

Semi-preparative gas chromatography was performed on an HP 5890 GC (Agilent, USA), equipped with a three-way glass splitter separating the gas flow post column into the FID and the collector. An RTX-5 column, 30 m × 0.53 mm id × 5 μm film (Restek, Bellefonte, PA, USA) was used. Samples of 3 μL were injected in splitless mode (1 min) and helium was used as the carrier gas. A custom-made manual fraction collector was used, with samples collected in glass capillaries (100 × 1.55 mm id, Hirschmann Laborgeräte, Eberstadt, Germany) positioned in an aluminium holder submerged in a dry ice/acetone bath. All fractions were eluted with dichloromethane and stored at −20 ◦C until used for microderivatisation experiments [26].

GC-EAD data were recorded using an Agilent 6890 GC equipped with an identical column as the GC-MS and a flame ionization detector (FID) using helium as carrier gas. A GC effluent splitter (split ratio 1:1) was used to split the flow to the FID and EAD. The split for EAD was passed through a Syntech effluent conditioner (Syntech, Buchenbach, Germany) containing a heated transfer line, with the outlet placed in a purified and humidified airstream, where the electrodes holding the antenna were presented. For each EAD run, an excised antenna with the tip cut off, was mounted on a holder consisting of two electrodes using electrode gel. The electrode was connected to a PC via a serial Syntech intelligent data acquisition controller (IDAC) interface for simultaneous recording of the FID and EAD signals in the Syntech software package.

Solvents for extractions and purifications were of HPLC grade.
