These are compounds that contain a positively charged carbon atom and a negatively charged atom (such as nitrogen, phosphorus, or sulfur) attached to it.
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N-Benzhydrylidene-N'-[5,5-dimethyl-2-selena-bicyclo[2.1.1]hex-(3Z)-ylidene]-hydrazine
2-Penten-1-one, 1,4-diphenyl-, (2E)-
2,4-Bis-(4-fluoro-phenyl)-6,7,8,9-tetrakis-trifluoromethyl-1,3-diaza-spiro[4.4]nona-1,3,6,8-tetraene
