Start with a C1=C2 double bond. These two sp2 carbons are the shared bridge-heads of two five-membered 1,3-dithiole rings, Ring I and Ring II, arranged as mirror images.

1,3-dithiole framework for both Ring I and Ring II
   - Each ring has two sulfur atoms in a meta relationship.
   - The carbon between the two sulfurs is the bridge-head: C1 in Ring I and C2 in Ring II.
   - C1 and C2 are joined by the C1=C2 double bond (this connects the two rings).
   - Within each five-membered ring, the other two carbons (not C1/C2) form the ring's only internal C=C; all remaining ring bonds are single.

Ring I substituents:
   - The two carbons of Ring I'd internal C=C each bear a terminal sulfanyl group (-SH).

Ring II fusion:
   - The two carbons of Ring II's internal C=C are instead fused to a third ring, Ring III.

Ring III description:
   - Ring III is a six-membered ring with two sulfurs in para positions.
   - It fuses to Ring II through two adjacent carbons.
   - Aside from the fusion junction bonds, all bonds in Ring III are single.



In the ring, the other two carbons (not the C1 or C2) are double bonded, the other bonds in the rings are single bonded.
   - Now, Ring I and Ring II are mirror-symmetric.

3. Now, for Ring I. 
   - Each carbon bonded by the only double bond bears a terminal sulfanyl group (-SH).

4. For Ring II
   - The two carbons bonded by the only double bond are fused with the other ring Ring III.
   - Ring III is a six-membered ring with two sulfurs in a para positions.
   - Ring III fuses with Ring II with the two adjacent carbons.
   - Excluding the bond in ring junctions, the other bond in Ring III is single bonds.

In total, this molecule has eight sulfur atoms.