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Typical Gas chromatogram of rectal gland extract of B. frauenfeldi males. The numbered peaks indicate detected compounds: (E,E)-2,8-dimethyl-1,7-dioxaspiro[5.5]undecane (3), (E,E)-2-ethyl-8-methyl-1,7-dioxaspiro[5.5]undecane (4), palmitoleic acid (16), palmitic acid (17), and ethyl oleate (21).
