請麻煩各位英文好的人能夠幫忙翻譯下面這段文章 這是有關天然物的文章
Bioassay-guided fractionation of an ethanol extract of a Madagascar collection of the fruits of Cordyla madagascariensis ssp. madagascariensis led to the isolation of the four new cassane diterpenoids 1-4. The 1H and 13C NMR spectra of all compounds were fully assigned using a combination of 2D NMR experiments, including COSY, HSQC, HMBC,
and ROESY sequences. All of the isolates were tested against the A2780 human ovarian cancer cell line, and compounds 1 and 2 showed mild antiproliferative activity with IC50 values of 10 and 36 μM, respectively.
一些儀器的專有名詞不用翻譯沒關係 其他請別用翻譯器 謝謝