20207
OBJECTIVES : The aim of this investigation was to determine whether the in vivo characteristics of the different D1 receptor tracers used in previous reports , [ ( 11 ) C ] SCH23390 and [ ( 11 ) C ] NNC112 , may have contributed to these discrepancies reported in the literature .
 Chemical: [ ( 11 ) C ] SCH23390; Chemical: [ ( 11 ) C ] NNC112
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: [ ( 11 ) C ] SCH23390; Chemical: [ ( 11 ) C ] NNC112