Reactions of 1,3-thiazine-2,6-dithiones. Part 7. Formation reactions of 3-thioureidocinnamthioamides, 3-[bis(alkylthio)methyleneamino]- and 3-[bis(alkoxy)methyleneamino]-dithiocinnamic acid esters by the thiazine ring opening reactions with primary amines, thiols, and alcohols. Recyclizing reactions of the acyclic thioamides and the alkyl dithiocinnamates and some related compounds