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1-(2-Hydroxy-julolidin-4-yl)-3-(1,4-dihydro-2-hydroxy-julolidin- 4-ylidene-onium)-2-oxo-cyclobuten-4-olate

1-(3,4-Diphenyl-5-morpholino-thien-2-yl)-3-(2,5-dihydro-3,4-diphenyl-5-morpholin-1-ylidene-onium-thien-2-ylidene)-2-oxo-cyclobuten-4-olate

1-(1,1,3-Trimethyl-1H-benzoeindol-2-ylidene-methyl)-3-(1,1,3-trimethyl-1H-benzoeindolium-2-yl-methylene)- cyclobuten-2-one-4-olate

Squarylium dye III

1-(5-Piperdino-thien-2-yl)-3-(2,5-dihydro-5-piperidin-1-ylidene-onium-thien-2-ylidene)-2-oxo-cyclobuten-4-olate

3-(5-Dimethylamino-thien-2-yl)-5-(2,5-dihydro-5-dimethylimmonium-thien-2-ylidene)-1,2-dioxo-cyclopenten-4-olate

3-(4-Dimethylamino-2-hydroxy-phenyl)-5-(4-dimethylimmonium-2-hydroxy-cyclohexa-2,5-dien-1-ylidene)--1,2-dioxo-cyclopenten-4-olate

3-(2-Pyrrolidino-thien-2-yl)-5-(2,5-dihydro-4-methyl-2-pyrrolidin-1-ylidene-onium-thien-5-ylidene)-1,2-dioxo-cyclopenten-4-olate

3-(2-Hydroxy-julolidin-4-yl)-5-(1,4-dihydro-2-hydroxy-julolidin-4-ylidene-onium)-1,2-dioxo-cyclopenten-4-olate

3-(4-Diethylamino-2-hydroxy-phenyl)-5-(4-diethylimmonium-2-hydroxy-cyclohexa-2,5-dien-1-ylidene)-1,2-dioxo-cyclopenten-4-olate

3-(2-Morpholino-thien-2yl)-5-(2,5-dihydro-4-methyl-2-morpholin-1-ylidene-onium-thien-5-ylidene-1,2-dioxo-cyclopenten-4-olate

5-(4-Diethylamino-phenyl)-3-2-(4-diethylamino-phenyl)- ethenyl-1-phenyl-4,5-dihydro-1H-pyrazole

2-(4-Methylphenyl)-6-phenyl-4H-thiopyran-4-ylidene-propanedinitrile-1,1-dioxide

9-Ethyl-carbazole-3-aldehyde-N-methyl-N-phenylhydrazone

9-Ethyl-carbazole-3-aldehyde-N,N-diphenylhydrazone

4-Diphenylamino-benzaldehyde-N,N-diphenylhydrazone

p-Dibenzylaminobenzaldehyde,N,N-diphenyl-hydrazone

4,4',4""-Trismethyl triphenylamine

4,4'-Bis(dihydro-dibenz-azepin-1-yl)biphenyl

9-Dicanomethylene-2,4,7-trinitrofluorene

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