2019
By using pharmacokinetic pharmacodynamic modeling the pharmacodynamics of racemic metoprolol and the active S - isomer , were quantitated in EMs and PMs in terms of IC50 values , representing metoprolol plasma concentrations resulting in half - maximum receptor occupancy .
 Chemical: metoprolol; Chemical: metoprolol
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: metoprolol; Chemical: metoprolol