30595
Four ( 99m ) Tc - labeled dibenzylideneacetone derivatives and corresponding rhenium complexes were successfully synthesized and biologically evaluated as potential imaging probes for A beta plaques using SPECT .
 ( 99m ) Tc - labeled dibenzylideneacetone, rhenium
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ( 99m ) Tc - labeled dibenzylideneacetone, rhenium