12809
Short half - life is a limitation for p - cymene application and several approaches have been used to improve pharmaceutical properties of monoterpenes , including the employment of drug - delivery systems .
 Chemical: p - cymene; Chemical: monoterpenes
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: p - cymene; Chemical: monoterpenes