18342
Thus , we demonstrate that new mechanically robust and easily detectable ( by astralen signal or optically ) core - shell microspheres based on biocompatible CaCO3 can be used as SERS platform .
 Chemical: CaCO3
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: CaCO3