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(4E)-2-[2-(dibenzylamino)-4-phenyl-1,3-thiazol-5-yl]-4-[2-(dibenzyliminio)-1,3-thiazol-5(2h)-ylidene]-3-oxo-1-cyclobuten-1-olate

(4Z)-2-[4-(dimethylamino)-2-fluorophenyl]-4-[4-(dimethyliminio)-2-fluoro-2,5-cyclohexadien-1-ylidene]-3-oxo-1-cyclobuten-1-olate

(4Z)-3-oxo-4-[4-phenyl-2-(1-piperidiniumylidene)-1,3-thiazol-5(2h)-ylidene]-2-[4-phenyl-2-(1-piperidinyl)-1,3-thiazol-5-yl]-1-cyclobuten-1-olate

(4Z)-3-oxo-4-(1,2,5-trimethyl-3h-pyrrolium-3-ylidene)-2-(1,2,5-trimethyl-1h-pyrrol-3-yl)-1-cyclobuten-1-olate

1,3-Dihydroxy-2,4-bis[5-(1-pyrrolidinyl)-2-thienyl]-cyclobutenediylium bis(inner salt)

(4E)-4-(4-ethyl-3,5-dimethyl-2h-pyrrolium-2-ylidene)-2-(4-ethyl-3,5-dimethyl-1h-pyrrol-2-yl)-3-oxo-1-cyclobuten-1-olate

(4E)-2-[4-(diethylamino)-2-hydroxyphenyl]-4-[4-(diethyliminio)-2-hydroxy-2,5-cyclohexadien-1-ylidene]-3-oxo-1-cyclobuten-1-olate

(4E)-2-[4-(dimethylamino)-2-hydroxy-6-methylphenyl]-4-[4-(dimethyliminio)-2-hydroxy-6-methyl-2,5-cyclohexadien-1-ylidene]-3-oxo-1-cyclobuten-1-olate

(4E)-3-oxo-4-[4-phenyl-2-(1-pyrrolidiniumylidene)-1,3-thiazol-5(2h)-ylidene]-2-[4-phenyl-2-(1-pyrrolidinyl)-1,3-thiazol-5-yl]-1-cyclobuten-1-olate

(4Z)-4-[(3-butyl-1,1-dimethyl-1h-benzo[e]indolium-2-yl)methylene]-2-[(e)-(3-butyl-1,1-dimethyl-1,3-dihydro-2h-benzo[e]indol-2-ylidene)methyl]-3-oxo-1-cyclobuten-1-olate