C=C1[C@@H](C)[C@H]2[C@H](Cc3ccccc3)NC(=O)[C@@]2(O)[C@@H](/C=C/C[C@H](C)CCC[C@@]2(OC)C=CC(=O)O2)[C@@H]1O	20-methoxycytochalasin B γ-lactone