Synthesis of [1,3]dithiole and spiro[1,3] dithiole thiopyran derivatives of the [1,2]dithiolo[1,4]thiazine ring system

1. Barriga, S.
2. Fuertes, P.
3. Marcos, C.F.
4. Rakitin, O.A.
5. Torroba, T.