19818
Polyhedral oligomeric silsesquioxane ( POSS ) cubic cage systems ( octa - n - octadecyloctasilsesquioxane , ( T8C18 ) and octakis ( n - octadecyldimethylsiloxy ) octasilsesquioxane , ( Q8C18 ) ) were synthesised with eight long n - alkyl chain ( R = C18H37 ) substituent arms , as model nano - functionalized compounds .
 Chemical: Polyhedral oligomeric silsesquioxane; Chemical: POSS; Chemical: octa - n - octadecyloctasilsesquioxane; Chemical: T8C18; Chemical: octakis ( n - octadecyldimethylsiloxy ) octasilsesquioxane; Chemical: Q8C18; Chemical: C18H37
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: Polyhedral oligomeric silsesquioxane, POSS, octa - n - octadecyloctasilsesquioxane, T8C18, octakis ( n - octadecyldimethylsiloxy ) octasilsesquioxane, Q8C18, C18H37 
Answer:
 Chemical: Polyhedral oligomeric silsesquioxane; Chemical: POSS; Chemical: octa - n - octadecyloctasilsesquioxane; Chemical: T8C18; Chemical: octakis ( n - octadecyldimethylsiloxy ) octasilsesquioxane; Chemical: Q8C18; Chemical: C18H37