TABLE 3.

Mass spectra of tentatively identified anthracene metabolites formed by Mycobacterium sp. strain LB501T

Compound	Fragments (m/z [assignment, relative intensity])
Derivatized cis-4-(2-hydroxynapth-3-yl)-2-oxobut-3-enoic acid (peak D)	270(M+, 31), 239(-OCH3, 5), 223(43), 211(-OCH3-CO, 100), 196(-OCH3-CO-CH3, 14), 180(-OCH3-CO-OCH3 , 16), 168(14), 139(14), 76(12)
Derivatized 1,2-dihydroxyanthracene (peak E)	238(M+, 3), 223(-CH3, 100), 206(2), 193(-CH3-OCH2, 30), 176(-OCH3-OCH3, 44), 165(29), 151(-OCH3-OCH3-C2H, 11), 139(3), 126(-OCH3-OCH3-C2H-C2H, 3), 111(3), 99(1), 88(13), 75(4)