TABLE 2.

Mass spectra of the anthracene metabolite 6,7-benzocoumarin formed by Mycobacterium sp. strain LB501T compared to spectra from the literature

Compound (source or reference)	Fragments (m/z [assignment, relative intensity])
6,7-Benzocoumarin (this study, peak C)	196(M+, 100), 168(-CO, 48), 139(-CO-CHO, 56), 98(7), 84(6), 70(18), 63(7)
6,7-Benzocoumarin (5)	196(M+, 100), 168(-CO, 41), 139(-CO-CHO, 55), 98(8), 84(7), 70(21), 63(6)
5,6-Benzocoumarin (19)	196 (M+, 49), 168 (-CO, 100), 139 (-CO-CHO, 89), 70 (12), 63 (15)
7,8-Benzocoumarin (19)	196(M+, 66), 168(-CO, 100), 139(-CO-CHO, 89), 89(12), 63(15)