sponsored partly by grants from the Three-year Development Plan Project for Traditional Chinese Medicine(No.ZY(2018-2020)-CCCX-2001-02);the Shanghai Sailing Program(No.17YF1419500)and NSFC(No.81803545);We are also grateful to NSFC-Joint Foundation of Yunnan Province(No.U1902213);the Key-Area Research;Development Program of Guangdong Province(No.2020B1111110003)for financial support.
Main observation and conclusion Nineteen unprecedented 7-methoxylated caged xanthones(1—19)were isolated from the twigs of Garcinia oligantha under the guidance of NMR spectroscopy.Their structures and absolute confi...