14474
A pi - conjugated nanosheet comprising planar nickel bis ( dithiolene ) complexes was synthesized by a bottom - up method .
 Chemical: nickel bis ( dithiolene )
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: nickel bis ( dithiolene )