Rearrangement of derivatives of 1,3-dithian-5-amine into bicyclic 2-thiazolidines. Crystal structures of cis- and trans-1-(2-aryl-1,3-dithian-5-yl)-2-thioureas and cis- and trans-5-aryl-3-imino-7,7a-dihydro-1H,3H,5H-thiazolo[3,4-c]thiazoles

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