1540
For 2 - phpy , C - H bond activation in the [ NiCl ( phpy ) ( 2 ) ] ( + ) complex is significant , whereas this route is almost suppressed for the corresponding complexes of 3 - and 4 - phpy and only occurs at elevated energies .
 Chemical: 2 - phpy; Chemical: C - H; Chemical: [ NiCl ( phpy ) ( 2 ) ] ( + ); Chemical: 3 - and 4 - phpy
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: 2 - phpy; Chemical: C - H; Chemical: [ NiCl ( phpy ) ( 2 ) ] ( + ); Chemical: 3 - and 4 - phpy