I CH= CH-0-CH= N I1 CH-CH= CH-0-N r 1 I,/I I11 CH= CH--S-CH= N IV CH-CH= CH--SN has their pharmacology been systematically investigated. This paper is the first of a proposed series from this Laboratory dealing with such cycles, and in which we shall describe methods of synthesizing new amino derivatives of the sulfur cycle, thiazole, represented by Formula 111. All of the amines thus far prepared are being examined to ...