Table 2. Second-Tier (Group 2) Odor Modifier Compounds, Including 321MBT, “Masked” by the Group 1 Odorants.

	GC column retention time (min)	tentative chemical ID	odor descriptor
group 2	11.8	beta-pinene	“characteristic”, “pine”
	7.6	3-methyl-2-butene-1-thiol	“skunky”, “foul”
	7.2	hexanal	“grassy”, “green”
	12.7	unknown (possibly 1-octene-3-one)	“earthy”, “mushroom”
	3.5	diacetyl	“buttery”
	8.7	2-hexenal	“grassy”, “herbaceous”