CC(=O)OC[C@]1(C)[C@@H](OC(C)=O)CC[C@]2(C)C3=Cc4c(cc(-c5ccccc5)oc4=O)O[C@]3(C)[C@@H](OC(C)=O)C[C@@H]12	5-olefin phenylpyropene A