You are a chemist. Now you are given a description of a molecule. Please generate a molecule that meets the description.
system
Come up with a molecule based on the description: Decomposed by carbon dioxide, acids, and soluble salts of metals which form insoluble sulfides; sulfur, hydrogen sulfide and the metal sulfide being formed. The molecule has Unpleasant smell of hydrogen sulfide.
user
[Ca+2].[S-]SSS[S-]
assistant