GCMS was performed using a Hewlett Packard 6890-5973 GC-MS system operating in EI mode (equipped with a HP 5MS 30 m × 0.25 mm, 0.25 μm film thickness capillary column). Helium (1 mL/min) was used as carrier gas. The initial temperature of the column was 60 °C; it was then heated to 280 °C at a rate of 3 °C/min.
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