Abstract
In the continuing study of the chemical compositions of the strain Streptomyces bingchenggensis, three new milbemycin derivatives, milbemycin α31 (1), secomilbemycins C (2), and D (3), were isolated. Their structures were established on the basis of extensive spectroscopic analysis.
Acknowledgements
This research work was financially supported by the National Natural Science Foundation of China (Nos 30571234 and 30771427), the National Key Technology R&D Program (No. 2006BAD31B02), and the Outstanding Youth Foundation of Heilongjiang Province (No. JC200706).