TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation: No general preparation given. Preferred Compound: The anthracene derivative is preferably chosen from 10 compounds e.g. dithia-6,8,16,18-tetraazapentacyclo(11.7.0.03,11.05,9.015,19)icosa-1(20),2,4,6,7,9,11,13,15,18-decaene, dithia-5,7,15,17-tetraazapentacyclo(11.7.0.03,11.04,8.014,18)icosa-1(13),2,4(8),5,6,9,11,14,17,19-decaene, dithia-5,7,17,19-tetraazapentacyclo(11.7.0.03,11.04,8.016,20)icosa-1(13),2,4(8),5,6,9,11,14,16,19-decaene, dithia-5,7,16,18-tetraazapentacyclo(11.7.0.03,11.04,8.015,19)icosa-1,3(11),4,7,9,12,14,16,17,19-decaene, and trithia-5,7,15,17,20,22-hexaazahexacyclo(11.10.0.03,11.04,8.014,18.019,23)tricosa-1(13),2,4(8),5,6,9,11,14(18),15,16,19,22-dodecaene. Preferred Definitions:    hydrocarbyl or heterocyclyl=3-20-membered aryl optionally substituted by group of formula (ii) or (v);    R1=H, -ORa1, -SRb1, halo, 1-18C alkyl, optionally substituted 6-18C aryl, optionally substituted 3-18-membered heterocyclyl, or group of formula (iii) or (iv);    Ra1,Rb1=1-18C alkyl, 2-18C alkenyl, 2-18C alkynyl, optionally saturated 3-18C cyclic hydrocarbyl, or 3-18-membered optionally saturated heterocyclyl (all optionally substituted), or H;    R2-R6=Ra1;    R7=H, halo, optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted optionally saturated cyclic hydrocarbyl, or optionally substituted optionally saturated heterocyclyl;and    R8,R9=H or halo.    EXAMPLE - 2.68 g 1,2,5,6-tetra-aminoanthraquinone was added to 50 ml thionyl chloride and 10 ml triethylamine, heated for 4 hours, cooled, and distilled to obtain 2.85 g Dithia-5,7,15,17-tetraazapentacyclo(11.7.0.03,11.04,8.014,18)icosa-4(8),5,6,9,14(18),15,16,19-octaene-2,12-dione (87%). 4.55 g triisopropylsilyl acetylene and 25 ml tetrahydrofuran were stirred at 0 degrees C in nitrogen atmosphere, 12.5 ml n-butyllithium was dripped in the reaction mixture, stirred at room temperature for 1 hour. 1.62g Dithia-5,7,15,17-tetraazapentacyclo(11.7.0.03,11.04,8.014,18)icosa-4(8),5,6,9,14(18),15,16,19-octaene-2,12-dione was added to mixture, and stirred for one night at room temperature, and water-containing diethyl ether was added to obtain 0.95 g 2,12-bis((2-(tris(propan-2-yl)silyl)ethynyl))-dithia-5,7,15,17-tetraazapentacyclo(11.7.0.03,11.04,8.014,18)icosa-4(8),5,6,9,14(18),15,16,19-octaene-2,12-diol. To 0.95 g 2,12-bis((2-(tris(propan-2-yl)silyl)ethynyl))-dithia-5,7,15,17-tetraazapentacyclo(11.7.0.03,11.04,8.014,18)icosa-4(8),5,6,9,14(18),15,16,19-octaene-2,12-diol, 3.32 g potassium iodide, 50 ml acetic acid, 2.12 g sodium hypophosphite hydrate were added, and heated for 1 hour to obtain 0.6 g 2,12-bis((2-(tris(propan-2-yl)silyl)ethynyl))-6,16-dithia-5,7,15,17-tetraazapentacyclo(11.7.0.03,11.04,8.014,18)icosa-1,3(11),4(8),5,6,9,12,14(18),15,16,19-undecaene (20%), as yellow crystals.