Molecules or atoms that are able to donate electrons.
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2-ethynyl-6-(phenylmethoxy)pyridine
dibenzyl [methyl (4,7,8,9-tetra-O-acetyl-3,5-dideoxy-5-trifluoroacetamido-D-glycero-β-D-galacto-non-2-ulopyranosid)ulonate] phosphite
1-chloro-4-(3-phenylpropoxy)benzene