18827
By employment of ( R ) - 2 - amino - 2 - ( 4 - methoxyphenyl ) ethanol as a chiral auxiliary , ( 2R ) - IKM - 159 and the ( 2S ) - counterpart were successfully synthesized in 0 . 70 % and 1 . 5 % yields , respectively , over a total of 18 steps .
 Chemical: ( R ) - 2 - amino - 2 - ( 4 - methoxyphenyl ) ethanol; Chemical: ( 2R ) - IKM - 159
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: ( R ) - 2 - amino - 2 - ( 4 - methoxyphenyl ) ethanol; Chemical: ( 2R ) - IKM - 159