Full Definitions:    X = -C(=W1)-W2-C(=W1)- (x1), -C(=W1)-N(-B1-A)-C(=W1)- (x2) or nitrogen containing moiety of formula (x3) for the formation of six membered ring, or CW1W1M;    Y1 = -L-NR1R2 (y1), -L-Z-R3 (y2), or -C(=W1)-W1-C(=W1)- (y3) or nitrogen containing moiety of formula (y4) to form six membered ring, or H;    W1 = O or S;    W2 = O, S or NR1a;    R = aryloxy, arylthio, hetaryloxy, hetarylthio, or optionally saturated 5-7-membered ring, in which the carbon skeleton is interrupted by one or more nonadjacent O, S, NR4, N=CR4, CO, SO and/or SO2, and annealed, where the total ring system is optionally substituted by (a) 1-30C-alkyl, whose carbon chain is interrupted by one or more nonadjacent O, S, NR4, N=CR4, C?=C, CR4=CR4, CO, SO and/or SO2, and one or more times substituted by 1-12C-alkoxy, 1-6C-alkylthio, C?=CR4, CR4=C(R4)2, OH, mercapto, halo, CN, NO2, NR9R10, NR5COR6, CONR5R6, SO2NR5R6, COOR7, SO3R7, P(R7)2, POR7R7, (het)aryl and/or optionally saturated 4-7C-cycloalkyl, whose carbon skeleton is interrupted by one or more nonadjacent O, S, NR4, N=CR4, CR4=CR4, CO, SO and/or SO2, where the (het)aryl and cycloalkyl is optionally substituted by one or more 1-18C-alkyl, (b) 3-8C-cycloalkyl, whose carbon skeleton is interrupted by one or more nonadjacent O, S, NR4, N=CR4, CR4=CR4, CO, SO and/or SO2, and further annealed, optionally saturated 5-7-membered rings, whose carbon skeleton is interrupted by one or more nonadjacent O, S, NR4, N=CR4, CR4=CR4, CO, SO- and/or SO2, where the total ring system is one or more times substituted by 1-18C-alkyl, 1-12C-alkoxy, 1-6C-alkylthio, C?=CR4, CR4=CR42, OH, mercapto, halo, CN, NO2, NR9R10, NR5COR6, CONR5R6, SO2NR5R6, COOR7, SO3R7, PR72 and/or POR7R7, (c) (het)aryl or further optionally saturated 5-7-membered ring, whose carbon skeleton is substituted by one or more nonadjacent O, S, NR4, N=CR4, CR4=CR4, CO, SO and/or SO2, and annealed, where the total ring system is substituted by one or more 1-18C-alkyl, 1-12C-alkoxy, 1-6C-alkylthio, C=CR4, CR4=CR42, OH, mercapto, halo, CN, NO2, NR9R10, NR5COR6, CONR5R6, SO2NR5R6, COOR7, SO3R7, PR72, POR7R7, (het)aryl, (het)aryloxy and/or (het)arylthio, where the (het)aryl is optionally substituted by one or more 1-18C-alkyl, 1-12C-alkoxy, 1-6C-alkylthio, OH, mercapto, halo, CN, NO2, NR9R10, NR5COR6, CONR5R6, SO2NR5R6, COOR7, SO3R7, PR72 or POR7R7, (d) U-aryl (where U is O, S, NR4, CO, SO or SO2), or (e) 1-12C-alkoxy, 1-6C-alkylthio, C?=CR4, CR4=CR42, OH, mercapto, halo, CN, NO2, NR9R10, NR5COR6, CONR5R6, SO2NR5R6, COOR7, SO3R7, PR72 and/or POR7R7;    P1 = NR1R2;    B1 = 1-6C-alkylene and/or phenylene (optionally substituted by one or more 1-12C-alkyl, NO2, CN and/or halo);    A = COOM, SO3M or PO3M2;    D1 = 1,2-phenylene, 1,2- or 2,3-naphthylene or 2,3- or 3,4-pyridylene (optionally substituted by one or more 1-12C-alkyl, 1-12C-alkoxy, OH, NO2 and/or halo);    M = H, alkali metal cation or (NR5)4+;    L = a chemical bond or (het)arylene of formula (-Ar1-) or (-Ar1-E-Ar1-), which is directly or over ethenyl or ethynyl bonded at the rylene skeleton;    Ar1 = optionally saturated and annealed 5-7 membered ring containing heteroatom as ring atoms, where the total ring system is optionally substituted by one or more phenyl, 1-12C-alkyl, 1-12C-alkoxy, 1-12C- alkylthio and/or NR5R6;    E = a chemical bond or a group of O, S, NR4, C?=C, CR4=CR4 or 1-6C-alkylene; either    R1, R2 = (a), (b) or (c); or    R1R2N = annealed, optionally saturated 5-7 membered ring, whose carbon chain is interrupted by one or more nonadjacent O, S and/or NR4, optionally saturated 4-8-membered ring, whose carbon chain is interrupted by one or more nonadjacent and/or -N=, where the total ring system is one or more substituted by 1-24C-alkyl, 1-18C-alkoxy, 1-18C-alkylthio and/or NR5R6, (het)aryl (optionally substituted by one or more 1-18C-alkyl, 1-18C-alkoxy, 1-18C-alkylthio and/or NR5R6));    Z = O or S;    R3 = (a) or (c);    R1a = H, 1-30C-alkyl (whose carbon chain is interrupted by one or more nonadjacent O, S, NR4, N=CR4, C?=C, CR4=CR4, CO, SO and/or SO2, and substituted by (b)-(e)), 3-8C-cycloalkyl, further optionally saturated and annealed 5-7-membered rings (whose carbon skeleton is interrupted by one or more nonadjacent O, S, NR4, N=CR4, CR4=CR4, CO, SO and/or SO2, and the total ring system is one or more times substituted by (a)-(e)), (hetaryl)azo (optionally substituted by 1-10C-alkyl, 1-6C-alkoxy and/or CN);    R4 = H or 1-18C-alkyl;    R5, R6 = H, 1-18C-alkyl (whose carbon chain is interrupted by one or more nonadjacent O, S, CO, SO and/or SO2 and substituted by one or more 1-12C-alkoxy, 1-6C-alkylthio, OH, mercapto, halo, CN, NO2 and/or COOR8), (het)aryl, further optionally saturated 5-7-membered rings (whose carbon skeleton is interrupted by one or more adjacent group O, S, CO and/or SO2 and annealed, and the total ring system is optionally substituted by one or more 1-12C-alkyl);    R7 = 1-18C-alkyl (whose carbon chain is interrupted by one or more O, S, CO, SO and/or SO2 and optionally substituted by one or more 1-12C-alkoxy, 1-6C-alkylthio, OH, mercapto, halo, CN, NO2 and/or COOR8), (het)aryl or further annealed, optionally saturated 5-7-membered rings (whose carbon skeleton is interrupted by one or more O, S, CO and/or SO2, and the total ring system is optionally substituted by one or more 1-12C-alkyl);    R8 = 1-18C-alkyl; either    R9, R10 = 1-30C-alkyl (whose carbon chain is interrupted by one or more nonadjacent O, S, NR4, N=CR4, C?=C, CR4=CR4, CO, SO and/or SO2 and optionally substituted by 1-12C-alkoxy, 1-6C-alkylthio, C?=CR4, CR4=CR42, OH, NR5R6, NR5COR6, (het)aryl and/or optionally saturated 4-7C-cycloalkyl, whose carbon skeleton is interrupted by one or more nonadjacent O, S, NR4, N=CR4 and/or CR4=CR4, where the (het)aryl and cycloalkyl is optionally substituted by one or more 1-18C-alkyl, (het)aryl or further annealed, optionally saturated 5-7-membered rings, whose carbon skeleton is interrupted by one or more nonadjacent groups of O, S, NR4, N=CR4, CR4=CR4, CO, SO and/or SO2; or    R9R10N = optionally saturated 5-7-membered ring, whose carbon chain is interrupted by one or more nonadjacent O, S and/or NR4, or one or two annealed, optionally saturated 4-8-membered rings, whose carbon chain is interrupted by nonadjacent groups and/or N=, where the total ring system is substituted by one or more 1-18C-alkoxy, 1-18C-alkylthio and/or NR5R6, (het)aryl (optionally substituted by one or more 1-18C-alkyl, 1-18C-alkoxy, 1-18C-alkylthio and/or NR5R6);    m = 1-4; and either    n, p = 0, 2 or 4 (when m is 1-3) or 0, 2, 4 or 6 (when m is 4); or    n+p = 0, 2 or 4 (when m is 1-3) or 0, 2, 4 or 6 (when m is 4).    Where: at least one of the residue Y1 is y1 or y2 and the other is H; at lease one of Y1 is y3 or y4 or both can be H; at least one of W1 or W2 is S.    SPECIFIC COMPOUNDS - The use of 6 compounds (I) is disclosed e.g. 2,9-Bis-(2,6-diisopropyl-phenyl)-5,6,12,13-tetraphenoxy-10-thioxo-3a,4,5,5a,9,10,12b,13,14,14a,14b,14c-dodecahydro-anthra(2,1,9-def;6,5,10-d'e'f')diisoquinoline-1,3,8-trione of formula (Ia), 2,9-bis-(2,6-diisopropyl-phenyl)-5,6,12,13-tetraphenoxy-3,8-dithioxo-2,3,3a,4,5,5a,8,9,12b,13,14,14a,14b,14c-tetradecahydro-anthra(2,1,9-def;6,5,10-d'e'f')diisoquinoline-1,10-dione, 2,9-bis-(2,6-diisopropyl-phenyl)-5,6,12,13-tetraphenoxy-3,10-dithioxo- 2,3,3a,4,5,5a,9,10,12b,13,14,14a,14b,14c-tetradecahydro-anthra(2,1,9-def;6,5,10-d'e'f')diisoquinoline-1,8-dione, 2,9-bis-(2,6-diisopropyl-phenyl)-5,6,12,13-tetraphenoxy-8,10-dithioxo-4,5,5a,8,9,10,12b,13,14,14a,14b,14c-dodecahydro-3aH-anthra(2,1,9-def;6,5,10-d'e'f')diisoquinoline-1,3-dione and 2,9-bis-(2,6-diisopropyl-phenyl)-5,6,12,13-tetraphenoxy-3a,4,5,5a,12b,13,14,14a,14b,14c-decahydro-anthra(2,1,9-def;6,5,10-d'e'f')diisoquinoline-1,3,8,10-tetrathione.    EXAMPLE - 2,9-Bis-(2,6-diisopropyl-phenyl)-5,6,12,13-tetraphenoxy-3a,4,5,5a,12b,13,14,14a,14b,14c-decahydro-anthra(2,1,9-def;6,5,10-d'e'f')diisoquinoline-1,3,8,10-tetraone (300 mg) in water free toluene (40 ml) was mixed with 2,4-bis-methylsulfanyl-(1,3,2,4)dithiadiphosphetane 2,4-disulfide (160 mg) under nitrogen, stirred and heated for over night. The obtained mixture was cooled to obtain 2,9-bis-(2,6-diisopropyl-phenyl)-5,6,12,13-tetraphenoxy-10-thioxo-3a,4,5,5a,9,10,12b,13,14,14a,14b,14c-dodecahydro-anthra(2,1,9-def;6,5,10-d'e'f')diisoquinoline-1,3,8-trione.