9241
Systematic experiments that vary the precursor compositions and temperatures used in the synthesis selectively generate different compositions and structures for the final nanocarbide ( W ( 2 ) C or WC ) products .
 W ( 2 ) C, WC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 W ( 2 ) C, WC