a molecule containing a radioactive isotope, used for imaging or tracking in biological systems
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N-(1,3-benzodioxol-5-ylmethyl)-N-(methylphenyl)urea
p-nitrophenyl 11-(1-diazocyclopenta-2,4-dien-2-ylcarbonyloxy)undecanoate
(2E,11R,11aS)-2-ethylidene-8,11-dihydroxy-7-methoxy-1,2,3,10,11,11a-hexahydro-5H-pyrrolo[2,1-c][1,4]benzodiazepin-5-one