Me
4
Cot —
S
4
C(NO
2
)
4
—
S
4
C
2
(NO
2
)
6
—
S
6
[6.5]Coronan —
S
6
Sn-bis(phthalocyanin) —
S
8
Sn(C
5
Ph
5
)
2
—
S
10