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We further selected the 5 - chloroindolin - 2 - one moiety for the extension to another series of compounds by varying the substituents ( R ( 2 ) ) at the phenyl group connected with the piperazine ring .
 Chemical: 5 - chloroindolin - 2 - one; Chemical: phenyl; Chemical: 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: 5 - chloroindolin - 2 - one; Chemical: phenyl; Chemical: piperazine