30617
Four new Ni ( II ) complexes of general formula [ Ni ( H2 - Qtsc - R ) 2 ] ( NO3 ) 2 ( H2 - Qtsc - R = 4N - substituted thiosemicarbazones of 2 - oxo - 1 , 2 - dihydroquinoline - 3 - carbaldehyde , where R = H ( 1 ) , Me ( 2 ) , Et ( 3 ) , or Ph ( 4 ) ) have been synthesized and characterized .
 Ni ( II ), [ Ni ( H2 - Qtsc - R ) 2 ] ( NO3 ) 2, H2 - Qtsc - R, 4N - substituted thiosemicarbazones, 2 - oxo - 1 , 2 - dihydroquinoline - 3 - carbaldehyde, H, Me, Et, Ph
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Ni ( II ), [ Ni ( H2 - Qtsc - R ) 2 ] ( NO3 ) 2, H2 - Qtsc - R, 4N - substituted thiosemicarbazones, 2 - oxo - 1 , 2 - dihydroquinoline - 3 - carbaldehyde, H, Me, Et, Ph