20707
Catalysts based on rhenium ( I ) or rhenium ( VII ) , palladium ( II ) , and lanthanum ( III ) were the most efficient in performing the nucleophilic substitution on the various alcohols with the O - centered nucleophiles .
 Chemical: rhenium ( I ); Chemical: rhenium ( VII ); Chemical: palladium ( II ); Chemical: lanthanum ( III ); Chemical: alcohols; Chemical: O
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: rhenium ( I ); Chemical: rhenium ( VII ); Chemical: palladium ( II ); Chemical: lanthanum ( III ); Chemical: alcohols; Chemical: O