13091
In contrast , the use of a rigid linker ( here mesitylphenyl ) leads to a well - defined active site far away from the surface , stabilized only by a phosphine ligand which under reaction conditions leaves probably irreversibly , leading to faster decomposition and deactivation of the catalysts .
 Chemical: mesitylphenyl; Chemical: phosphine
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: mesitylphenyl; Chemical: phosphine