[H]OO[C@@]1([H])C([H])([H])C2=C(OC1(C([H])([H])[H])C([H])([H])[H])[C@]1(C(=O)[C@@](C(=O)C3=C([H])C([H])=C([H])C([H])=C3[H])(C2=O)C(C([H])([H])[H])(C([H])([H])[H])[C@]([H])(C([H])([H])C([H])=C(C([H])([H])[H])C([H])([H])[H])C1([H])[H])C([H])([H])C([H])=C(C([H])([H])[H])C([H])([H])[H]