Atoms of the same element that have different numbers of neutrons and consequently different masses. In this case, fluorine-18 is a radioactive isotope of fluorine.
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p-[18F]fluorobenzyl bromide
isopropyl (RS)-2-phenyl-2-oxazoline-4-d-4-carboxylate
C30(13)CH48N6O8Si2
1-Phospha-1-butyne, 3,3-dimethyl-
sodium bis(diphenylmethyl) <18O4>phosphate
C11H13(2)H2NO
