H
2
O
2
—
C
2
PPh
3
—
C
3
[4]asteran —
C
4
F-Corannulen —
C
5
[Cp(CHF
2
)
5
]Fe(P
5
) —
C
5
α-Cyclodextrin —
C
6
[16]Helicen —
C
2