8238
Removal of the ( BINAP ) Pt ( II ) pendants from NT ( Py ) ( [ ( R ) - Pt ] ) or NT ( Py ) ( [ ( S ) - Pt ] ) with ethylenediamine yielded metal - free nanotubes ( NT ( Py ) ) that remained optically active even upon heating without any change in the circular dichroism spectral profile .
 Chemical: ( BINAP ) Pt ( II ); Chemical: Py; Chemical: [ ( R ) - Pt ]; Chemical: Py; Chemical: [ ( S ) - Pt ]; Chemical: ethylenediamine; Chemical: Py
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: ( BINAP ) Pt ( II ); Chemical: Py; Chemical: [ ( R ) - Pt ]; Chemical: Py; Chemical: [ ( S ) - Pt ]; Chemical: ethylenediamine; Chemical: Py