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Selected ions are specific for 24,25-dinorursa-1,3,5(10),12-tetraene (m/z 361+376), 24,25-dinorursa-1,3,5(10),9(11),12-pentaene (m/z 359+374), 24,25,26,27-tetranorursa-1,3,5(10),6,8,10,13-heptaene (m/z 357+342) and corresponding oleanane compounds and 2,9-dimethylpicene (m/z 289+306).
