Table 5.

Known and putatively novel secondary metabolites found from the selected isolates in chemical analysis.

Isolate	Known secondary metabolites			Putatively novel secondary metabolites
	Nos.	Mass (m/z) and related compounds∗	Structural class and activity	Nos.	Mass (m/z)
SAS02	1	[M+H]+ = 568.1903 Doxorubicinol	Anthracyclines, anticancer activity	12	[M+H]+ = 135.0182, 146.032, 174.0224, 129.0087, 254.0471, 265.0616, 489.2129, 265.0617, 449.1854, 489.2149, 526.1938, 537.2806
SAS09	2	[M+H]+ = 568.2139 Pyrromycin	Anthracycline glycoside, antibacterial activity	5	[M+H]+ = 120.0145, 191.0056, 322.03, 852.3207, 812.3345
		[M+H]+ = 790.4954 Erythromycin	Macrolide, antibacterial activity
SAS13	2	[M+H]+ = 568.2149 Pyrromycin	Anthracycline glycoside, antibacterial activity	6	[M+H]+ = 129.9969, 147.0222, 550.1804, 731.4479, 376.2484, 825.3443
		[M+H]+ = 790.4945 Erythromycin	Macrolide, antibacterial activity
SAS15	1	[M+H]+ = 746.4712 14-hydroxy-6-omethylerythromycin A	Macrolide, antibacterial activity	9	[M+H]+ = 210.082, 590.2232, 337.0776, 111.0018, 618.2537, 279.0547, 640.5538, 616.3332, 657.418

^∗Compounds were identified by comparing with molecular feature of known compounds available in natural product databases and literatures.