Pyran is a six-membered oxygen-containing heterocyclic compound. The derivatives mentioned likely refer to chemical compounds that have pyran as a structural component.
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2-(5-(4-bromophenyl)-6H-1,3,4-oxadiazin-2-yl)acetonitrile
N-benzylidene-4'-<(3,6-dihydro-4-methyl-2H-pyran-3-yl)amino>aniline
