27061
The catalyst with the lowest loading shows high activity in its initial use as the homogeneous L ( t ) ( Bu ) / Ni catalyst , with some metal leaching .
 Chemical: L ( t ) ( Bu ); Chemical: Ni
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: L ( t ) ( Bu ); Chemical: Ni