TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Claimed): 2 Methods for preparation of the compound (I) are given.(A) Process (1): (a) synthesizing 2,5-dihyxylbenzene-1,4-diamine from 1,4-dibromohexyl benzene; (b) synthesizing 1,1'-(2,5-dihexyl-1,4-phenylene)bis(thiourea) from 2,5-dihexylbenzene-1,4-diamine; (c) synthesizing 4,8-dihexylbenzo(1,2-d:4,5-d')bis(thiazole)-2,6-diamine from 1,1'-(2,5-dihexyl-1,4-phenylene)bis(thiourea); and (d) synthesizing benzobisthiazole derivative 2,6-dibromo-4,8-dihexylbenzo(1,2-d:4,5-d')bis(thiazole) (I') from 4,8-dihexylbenzo(1,2-d:4,5-d')bis(thiazole)-2,6-diamine; and(B) Process (2): (a1) synthesizing 2,5-dihyxylbenzene-1,4-diamine from 1,4-dibromohexyl benzene; (b1) synthesizing N,N'-(((2,5-dihexyl-1,4-phenylene)bis(azanediyl))bis(carbonothioyl))dibenzamide from 2,5-dihyxylbenzene-1,4-diamine; (c1) synthesizing 1,1'-(2,5-dihexyl-1,4-phenylene)bis(thiourea) from N,N'-(((2,5-dihexyl-1,4-phenylene)bis(azanediyl))bis(carbonothioyl))dibenzamide; (d1) synthesizing 4,8-dihexylbenzo(1,2-d:4,5-d')bis(thiazole)-2,6-diamine from 1,1'-(2,5-dihexyl-1,4-phenylene)bis(thiourea); and (e1) synthesizing 2,6-dibromo-4,8-dihexylbenzo(1,2-d:4,5-d')bis(thiazole) from 4,8-dihexylbenzo(1,2-d:4,5-d')bis(thiazole)-2,6-diamine.Preferred Components: The compound (I) has mass spectrometry peak as given in the specification. Preferred Definitions:    X1=N;    Y1=S;    Z1=Br;    R=n-alkane having 6 carbons.    SPECIFIC COMPOUNDS - 1 Compound i.e. 2,6-dibromo-4,8-dihexylbenzo(1,2-d:4,5-d')bis(thiazole) (I') is specifically claimed as (I).    EXAMPLE - An 150 ml anhydrous chloroform (CHCl3) solution of 1.92 g bromine (Br2), was added to an 200 ml anhydrous CHCl3 solution, 1,1'-(2,5-dihexyl-1,4-phenylene)bis(thiourea) at room temperature dropwise over a period of 30 minutes. The mixture was stirred for 24 hours. The mixture was then refluxed at 60 degrees C for 24 hours. After work up, 4,8-dihexylbenzo(1,2-d:4,5-d')bis(thiazole)-2,6-diamine from 1,1'-(2,5-dihexyl- 1,4-phenylene)bis(thiourea) (2 g, yield 80%) was obtained. 4,8-dihexylbenzo(1,2-d:4,5-d')bis(thiazole)-2,6-diamine. A 31 mg tert-butyl nitrite liquid, was added to 40 ml anhydrous methyl cyanide (CH3CN) of 54 mg copper bromide (CuBr2). A solid of 78 mg 4,8-dihexylbenzo(1,2-d:4,5-d')bis(thiazole)-2,6-diamine, was added to the mixture portion-wise. The mixture was then refluxed at 65 degrees Co for 1 hour. The mixture was cooled and then poured into 200 ml aqueous hydrochloric acid and extracted with 150 ml dichloromethane (CH2Cl2). After work up, 2,6-dibromo-4,8-dihexylbenzo(1,2-d:4,5-d')bis(thiazole) (I') (51 mg, yield 50%) was obtained.