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system
What is the molecular formula of the molecule N-(9,9-dimethylfluoren-1-yl)-N-(9,9-dimethylfluoren-2-yl)-9,9'-spirobi[fluorene]-3-amine;N-(9,9-dimethylfluoren-1-yl)-N-(2-phenylphenyl)-9,9'-spirobi[fluorene]-3-amine;N-(9,9-dimethylfluoren-2-yl)-N-(2-phenylphenyl)-9,9'-spirobi[fluorene]-3-amine;N-(9,9-dimethylfluoren-2-yl)-N-(2-phenylphenyl)-9,9'-spirobi[fluorene]-4-amine ?
user
C211H152N4
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