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Hence , in this work , we present a facile approach to produce water - soluble ( cadmium - free ) quaternary Zn - Ag - In - S ( ZAIS ) QDs .
 cadmium, Zn, Ag, In, S, ZAIS
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 cadmium, Zn, Ag, In, S, ZAIS