| 摘要 |
Disclosed is a compound of formula I, or a pharmaceutically acceptable salt, tautomer, prodrug, or stereoisomer thereof, wherein the dotted line represents an optional additional bond, making R1, R5, or R2 absent as appropriate, X is selected from O, S, or NRa, and wherein the other substituents are as defined in the specification. Also disclosed is a process for obtaining the compound by extracting and isolating it from the coral Meandrina meandrites. Also disclosed is the use of the compound for treating cancer.
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