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Synthesis , characterization and in vitro pharmacological evaluation of new water soluble Ni ( II ) complexes of 4N - substituted thiosemicarbazones of 2 - oxo - 1 , 2 - dihydroquinoline - 3 - carbaldehyde .
 Ni ( II ), 4N - substituted thiosemicarbazones, 2 - oxo - 1 , 2 - dihydroquinoline - 3 - carbaldehyde
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Ni ( II ), 4N - substituted thiosemicarbazones, 2 - oxo - 1 , 2 - dihydroquinoline - 3 - carbaldehyde