21419
Novel 4 - ( 4 - bromophenyl ) phthalazine derivatives connected via an alkyl spacer to amine or N - substituted piperazine were designed and synthesized as promising alpha - adrenoceptor antagonists .
 Chemical: 4 - ( 4 - bromophenyl ) phthalazine; Chemical: alkyl; Chemical: amine; Chemical: N - substituted piperazine
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: 4 - ( 4 - bromophenyl ) phthalazine; Chemical: alkyl; Chemical: amine; Chemical: N - substituted piperazine