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Syntheses and antibacterial activity of Schiff bases from 16 - isopropyl - 5 , 9 - dimethyltetracyclo [ 10 . 2 . 2 . 0 ( 1 , 10 ) . 0 ( 4 , 9 ) ] hexadec - 15 - ene - 5 , 14 - dicarboxylic acid .
 Schiff bases, 16 - isopropyl - 5 , 9 - dimethyltetracyclo [ 10 . 2 . 2 . 0 ( 1 , 10 ) . 0 ( 4 , 9 ) ] hexadec - 15 - ene - 5 , 14 - dicarboxylic acid
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Schiff bases, 16 - isopropyl - 5 , 9 - dimethyltetracyclo [ 10 . 2 . 2 . 0 ( 1 , 10 ) . 0 ( 4 , 9 ) ] hexadec - 15 - ene - 5 , 14 - dicarboxylic acid