Table 2. List of the 12 peaks considered in this study.

Measured mass (Th)		Theoretical mass (Th)	Error (ppm) *	Tentative identification	Sum formula of base peak
33.033	33.0335		−10.7	Methanol	CH4O·H+
73.065		73.0648	8.1	2-butanone	C4H8OH+
87.082		87.0804	18.4	2- or 3-pentanone	C5H10OH+
89.030		89.0294	9.8	NS-compound	C3H7NS+
91.030		91.0291	7.4	N-compound	C5H3N2+
95.086		95.0855	4.3	Heptadienol	C7H11+
121.033		121.0318	10.8	S-compound	C4H8O2S·H+
129.126		129.1274	−14.4	C8-ketone	C8H16O·H+
135.119		135.1168	17.5	Terpene related	C10H14·H+
137.137		137.1325	35.2	Monoterpenes	C10H17+
143.144		143.1430	6.7	C9-ketone	C9H18O·H+
149.098		149.0995	−6.5	Sulfoxide-compound	C7H16OS·H+

^*The difference between measured and expected mass is reported as part per million (ppm).