21418
Novel 4 - substituted - 2 ( 1H ) - phthalazinone derivatives : synthesis , molecular modeling study and their effects on alpha - receptors .
 Chemical: 4 - substituted - 2 ( 1H ) - phthalazinone
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 - substituted - 2 ( 1H ) - phthalazinone