[H]N1C([H])=C(C(C2=C([H])N([H])C3=C([H])C([H])=C([H])C([H])=C23)=C2C([H])=NC3=C([H])C([H])=C([H])C([H])=C23)C2=C([H])C([H])=C([H])C([H])=C12