A cyclic structure consisting of four atoms, often strained and reactive.
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4,4-Dimethyl-1-phenyl-2-(1-phenyl-3,3-bis-trifluoromethyl-1,3-dihydro-benzo[c][1,2]oxasilol-1-yl)-pentan-1-ol
Diphenyl-2-(piperidin-1'-yl)propylphosphinoxid
