4118
Theoretical investigation of a novel high density cage compound 4 , 8 , 11 , 14 , 15 - pentanitro - 2 , 6 , 9 , 13 - tetraoxa - 4 , 8 , 11 , 14 , 15 - pentaazaheptacyclo [ 5 . 5 . 1 . 1 ( 3 , 11 ) . 1 ( 5 , 9 ) ] pentadecane .
 4 , 8 , 11 , 14 , 15 - pentanitro - 2 , 6 , 9 , 13 - tetraoxa - 4 , 8 , 11 , 14 , 15 - pentaazaheptacyclo [ 5 . 5 . 1 . 1 ( 3 , 11 ) . 1 ( 5 , 9 ) ] pentadecane
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 4 , 8 , 11 , 14 , 15 - pentanitro - 2 , 6 , 9 , 13 - tetraoxa - 4 , 8 , 11 , 14 , 15 - pentaazaheptacyclo [ 5 . 5 . 1 . 1 ( 3 , 11 ) . 1 ( 5 , 9 ) ] pentadecane