Angucyclines from an insect-derived actinobacterium Amycolatopsis sp. HCa1 and their cytotoxic activity

One new angucyclinone derivative, amycomycin A (1), and one new angucycline, amycomycin B (2), and 5 known compounds (3-7), were isolated from an actinobacterium Amycolatopsis sp. HCa1 associated with the grasshopper, Oxya chinensis.