19089
The coupling between the adsorbates and the semiconductor , evidenced by the shift in absorption spectrum of modified Cu2O and the enhancement of non - totally symmetric modes of the 4 - MBA and 4 - mercaptopyridine ( 4 - MPY ) molecules , were invoked to explain the experimental results .
 Chemical: Cu2O; Chemical: 4 - MBA; Chemical: 4 - mercaptopyridine; Chemical: 4 - MPY
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: Cu2O; Chemical: 4 - MBA; Chemical: 4 - mercaptopyridine; Chemical: 4 - MPY