TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preparation (Disclosed): A pyrrole compound of formula (II) and pyrrole compound of formula (III) are reacted, to obtain precursor of formula (IV). The obtained precursor is reacted with carbonyl crosslinking agent of formula: Y1-C(=O)-Y2, to obtain intermediate compound (V). Then, the intermediate compound is reacted with alcohol compound of formula: Y"-CH2-CH2-OH, to obtain dioxolane compound of formula (VI). The compound is reacted with halogen-containing compound of formula: V"-X, to obtain dioxolane intermediate of formula (VII), which is then reacted with two cyclopentane compounds of formula (VIII) and (IX), to obtain nitrogen-containing compound of formula (X) from which protecting group is removed, to obtain nitrogen-containing condensed ring compound (I).Zasterisk=Z11;Y1,Y2=leaving group;V1,V2=reactive groups;Xasterisk=X21;X,X',X"=halo;Rasterisk=R21;Ar'=Ar21;Y"=Y1;andV"=V1. Preferred Definitions:    group (a)=group of formula (a');    R31=H, 1-20C alkyl, 1-20C fluoroalkyl, 1-20C alkoxy, or 1-20C fluoroalkoxy;    Z31=group of formula: -O-, -S-, -Se-, -Te-, -S(=O)-, or group chosen from group of formulae (g)-(j);    R81-R84=R11H;    R81+R82=ring;    Z11,Z12=-S-;    Z31=-S- or group (h);and    X21,X22=O.    SPECIFIC COMPOUNDS - 2 nitrogen-containing condensed ring compounds i.e. 5-(10-(2,2-dimethyl-1,3-dioxo-2,3-dihydro-1H-inden-5-yl)-7-oxo-3,11-dithia-5,9-diazatricyclo(6.3.0.02,6)undeca-1(8),4,9-trien-4-yl)-2,2-dimethyl-2,3-dihydro-1H-indene-1,3-dione and 5-(10-(5,5-dimethyl-4,6-dioxo-1,3a,4,5,6,6a-hexahydropentalen-2-yl)-7-oxo-3,11-dithia-5,9-diazatricyclo(6.3.0.02,6)undeca-2(6),4,9-trien-4-yl)-2,2-dimethyl-1,2,3,4-tetrahydropentalene-1,3-dione are disclosed.    EXAMPLE - (In mg) 4',10'-dimethyl-3',11'-dithia-5',9'-diazaspiro(1,3-dioxolane-2,7'-tricyclo(6.3.0.02,6)undecane)-1'(8'),2'(6'),4',9'-tetraene (113), 5-bromo-2,2-dimethyl-2,3-dihydro-1H-indene-1,3-dione (137), tetrakis(triphenylphosphine)palladium(0) (20) and toluene (1.5 mL) were added to the heat-dried test tube which is nitrogen substituted. The mixture was made to reflux for 14 hours. The resulted mixture is filtered, concentrated under reduced pressure and purified by gel-permeation chromatography, to obtain a red solid. The red solid was mixed with acetic acid (10 mL) and concentrated hydrochloric acid (1 mL) in a nitrogen-substituted round-bottom flask, heated at 100 degrees C, water was added to the mixture, chloroform was extracted, and the organic layer was dried with magnesium sulfate. The product was concentrated under reduced pressure and purified by gel-permeation chromatography, to obtain 5-(10-(2,2-dimethyl-3-oxo-2,3-dihydro-1H-inden-5-yl)-7-oxo-3,11-dithia-5,9-diazatricyclo(6.3.0.02,6)undeca-2(6),4,9-trien-4-yl)-2,2-dimethyl-2,3-dihydro-1H-indene-1,3-dione (61 mg and 70% of yield) as black solid.