[H]N(C([H])([H])C([H])([H])[H])C([H])([H])C([H])([H])C([H])([H])N(C1=C([H])C([H])=C([H])C([H])=C1[H])C1([H])C([H])([H])C2=C([H])C([H])=C([H])C([H])=C2C1([H])[H]