Coordinating ability of the heterocycles 1,3‐dithia‐2‐arsa‐ and stiba‐cyclopentanes. Part III. Dithioacid and dithiocarbamate complexes containing a free functional group. Crystal structure of 2‐pyrrolidonedithiocarbamate of 1,3‐dithia‐arsa‐cyclopentane | Publicación