C=C1[C@@H](C)[C@H]2[C@H](Cc3ccccc3)NC(=O)[C@]23OC(=O)O/C=C/C(C)(O)C(=O)[C@@H](C)C/C=C/[C@H]3[C@@H]1O Δ6,12-isomer of 5,6-dehydro-7-hydroxy-cytochalasin E