14624
The alkaloid ( - ) - tylophorine was isolated from a sample of Tylophora indica , and the crude extract was analyzed by HPLC / MS ( n ) and chiral HPLC / MS .
 ( - ) - tylophorine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ( - ) - tylophorine