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The synthesis and preliminary pharmacological evaluation of a series of potential atypical antipsychotic agents based on the structure of 1 - ( 1 , 2 - dihydro - 2 - acenaphthylenyl ) piperazine ( 7 ) is described .
 Chemical: 1 - ( 1 , 2 - dihydro - 2 - acenaphthylenyl ) piperazine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: 1 - ( 1 , 2 - dihydro - 2 - acenaphthylenyl ) piperazine