NOVELTY - Anthra(2,3-b:7,6-b')dithiophene derivatives (I) are new.    USE - (I) are useful: to prepare organic semiconducting formulation; as charge transport, semiconducting, electrically conducting, photoconducting or light emitting material in an optical, electrooptical, electronic, electroluminescent or photoluminescent components or devices, preferably organic field effect transistors, thin film transistors, integrated circuits, logic circuits, capacitors, radio frequency identification tags, devices or components, organic light emitting diodes, organic light emitting transistors, flat panel displays, backlights of displays, organic photovoltaic devices, solar cells, laser diodes, photoconductors, photodetectors, electrophotographic devices, electrophotographic recording devices, organic memory devices, sensor devices, charge injection layers, charge transport layers or interlayers in polymer light emitting diodes, organic plasmon-emitting diodes, Schottky diodes, planarizing layers, antistatic films, polymer electrolyte membranes, conducting substrates, conducting patterns, electrode materials in batteries, alignment layers, biosensors, biochips, security markings and security devices; and as components or devices for detecting and discriminating DNA sequences (all claimed).    ADVANTAGE - (I) provides organic semiconducting device with good electronic properties, preferably good solubility in organic solvents, thermal robustness for compatibility with annealing processes, high charge-carrier mobility, on/off ratio, oxidative stability and long lifetime. (I) easily provides organic field effect transistor device using solution deposition fabrication methods and printing techniques.    DETAILED DESCRIPTION - Anthra(2,3-b:7,6-b')dithiophene derivatives of formula (I) are new.    Y1-Y4 = -CH=, =CH- or -X-, where one of Y1-Y4 is -CH= or =CH- and the other is -X-;    X = -O-, -S-, -Se- or -NR0-;    R1, R2 = cyclic 1-20C-alkyl (where one or more non-adjacent CH2 groups are optionally replaced by -O-, -S-, -NR0-, -SiR0R00-, -CY0=CY00- or -CC- in such a way that O and/or S atoms are not linked directly to one another), or 4-20 membered (hetero)aryl or heteroaryl (both optionally substituted by L);    Ar1, Ar2 = 4-20 membered (hetero)aryl optionally substituted by L, preferably furan, thiophene, selenophene, N-pyrrole, pyrimidine, thiazole, thiadiazole, oxazole, oxadiazole, selenazole, bi-, tri- or tetracyclic groups (containing the above rings and optionally containing one or more benzene rings, where all the rings are connected by single bonds or fused with each other), thieno(3,2-b)thiophene, dithieno(3,2-b:2,3'-d)thiophene, selenopheno(3,2-b)selenophene-2,5-diyl, selenopheno(2,3-b)selenophene-2,5-diyl, selenopheno(3,2-b)thiophene-2,5-diyl, selenopheno(2,3-b)thiophene-2,5-diyl, benzo(1,2-b:4,5-b')dithiophene-2,6-diyl, 2,2-dithiophene, 2,2-diselenophene, dithieno(3,2-b:2',3'-d)silole-5,5-diyl, 4H-cyclopenta(2,1-b:3,4-b')-dithiophene-2,6-diyl, benzo(b)thiophene, benzo(b)selenophene, benzoxazole, benzothiazole or benzoselenazole;    L = cyclic 1-20C, preferably 1-12C-alkyl, 1-20C, preferably 1-12C-alkoxy, 1-20C, preferably 1-12C-oxaalkyl, 1-20C, preferably 1-12C-thioalkyl, cyclic 2-20C, preferably 2-12C-alkenyl, 2-20C, preferably 2-12C-alkynyl, 2-20C, preferably 2-12C-alkylcarbonyl, 2-20C, preferably 2-12C-alkoxycarbonyl, 2-20C, preferably 2-12C-alkylcarbonyloxy or 2-20C, preferably 2-12C-alkoxycarbonyloxy (all optionally substituted by F, Cl or OH), or silyl, germyl, 4-20 membered (hetero)aryl (all optionally substituted), P1-Sp-, F, Cl, Br, I, OH, CN, NO2, NCO, NCS, OCN, SCN, -C(=O)NR0R00, -C(=O)X0, -C(=O)R0, -NR0R00 or C(=O)OH;    P1 = a polymerizable group;    Sp = a spacer group or a single bond;    X0 = halo;    R0, R00 = H or 1-20C-alkyl;    Y0, Y00 = H, F, Cl or CN; and    m, n = 1 or 2.    INDEPENDENT CLAIMS are included for:    (1) a formulation comprising (I) and one or more organic solvents;    (2) an organic semiconducting formulation comprising (I) or their organic binders or precursors with a permittivity of less than or equal to 3.3 at 1000 Hz and optionally one or more solvents; and    (3) the preparation of (I).