Ethyl 3-(6-phenyl-4λ-1,2-dithiolo[1,5-b][1,2,4]dithia-zol-2-yl)propanoate.

The title compound, C(15)H(15)NO(2)S(3), exists in a bicyclic form, with resonance contributions from two monocyclic forms, each without a second S-S bond. The trithiapentalene heterocyclic ring system is planar, with a mean deviation of 0.014 (2) Å from the mean plane, and is inclined to the plane of the attached phenyl ring at an angle of 17.