Table 2.

Compound assignment and references for peaks listed in Table 1.

Peak	Proposed structure(s)	Ref.	Biological status
c1[a]		[48]	exhaled breath
c2		[49]	bacterial activity
c3		[50,51]	microbial activity; exposure
c4		[52,53]	bacterial activity
c5		[54,55]	bacterial activity
c6[a]		[54–57]	bacterial activity; malignancy
c7[a]		[55,58,59]	bacterial activity; malignancy; tuberculosis
c8[a]		[7]	malignancy
c9	not identified
c10[a] c11[a]		[60]	malignancy
c12[a]		[28]	influenza
c13
c14[a]

^[a]Tentative structural assignment; most-likely structures are shown.