Table 2. List of the compounds in the GC-MS of our samples collected in the two lungs, in the mixed-expired breath and in the breath dead space.

Order	Retention Time [min]	CAS #	Compound	Percentage of identification	p-value between lungs
1	2.38	64-17-5	Ethanol	99%	0.2278
2	3.05	78-93-3	2-Butanone	98%	0.8942
3	3.86	110-02-1	Thiophene	85%	0.3214
4	5.47	123-19-3	4-Heptanone	80%	0.6961
5	5.73	105-54-4	Butanoic acid, ethyl ester	93%	0.0678
6	6.46	13831-30-6	Acetic acid, (acetyloxy)-	88%	0.6210
7	7.09	108-94-1	Cyclohexanone	97%	0.4125
8	7.75	58037-87-9	Bicyclo[3.1.0]hexane, 4-methyl-1-(1-methylethyl)-, didehydro deriv.	88%	0.4218
9	7.80	996-12-3	Hexanal, 2,2-dimethyl-	87%	0.0738
10	7.96	3842-03-3	Butane, 1,1-diethoxy-3-methyl-	94%	0.0399
11	8.19	13442-89-2	Pentane, 1-(1-ethoxyethoxy)-	86%	0.7931
12	8.74	62016-28-8	Octane, 2,2,6-trimethyl-	89%	0.9392
13	8.95	104-76-7	1-Hexanol, 2-ethyl-	98%	0.8933
14	9.63	1120-21-4	Undecane	94%	0.8313
15	11.74	89-83-8	Thymol	88%	0.2814
16	11.93	18675-24-6	1-Decanol, 2-methyl-	95%	0.9570
17	13.04	17312-54-8	Decane, 3,7-dimethyl-	91%	0.9087

For each compound the elution time, the probability of identification and the p-value from the Kruskal-Wallis rank test aimed at differentiating the compound from ipsilateral and contralateral lungs.