Act of noting or perceiving a phenomenon or occurrence.
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1,3-diphenyl-6-(tert-butyl) fulvene
1-(2,4-dinitrophenyl)-2-(9H-fluoren-9-ylidene)hydrazine
trans-1-phenyl-3-trimethylsilyl-2-propen-1-ol
Cyclopentanone, 2-carbonyl-
