12935
A series of tetrahydroisoquinolines were designed , synthesized and evaluated as the first non - natural product type of compounds with dual D ( 1 ) receptor ( D ( 1 ) R ) agonism and D ( 2 ) receptor ( D ( 2 ) R ) antagonism properties for treatment of schizophrenia .
 Chemical: tetrahydroisoquinolines
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: tetrahydroisoquinolines