GC-MS analyses: A HP-6890 gas chromatograph equipped with a 5973 mass detector, using a HP-5MS column (30 m × 0.25 mm, 0.25 µm film thickness; Hewlett Packard, Palo Alto, CA, USA) was used with the following temp. program: 120◦ (3 min)—12◦/min—195◦ (10 min)—12...