19971
The structure - activity relationships showed that a leucinol moiety attached to the core - structure in the 7 - position together with alpha - methyl branched benzyl derivatives in the 5 - position displayed promising affinity , and selectivity as well as physicochemical properties , as exemplified by compounds 18a and 24h .
 Chemical: leucinol; Chemical: alpha - methyl; Chemical: benzyl
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: leucinol; Chemical: alpha - methyl; Chemical: benzyl