16760
Sipholenol A , a sipholane triterpene isolated from the Red Sea sponge Callyspongia siphonella , has the ability to reverse multidrug resistance in cancer cells that overexpress P - glycoprotein ( P - gp ) .
 Sipholenol A, sipholane triterpene
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Sipholenol A, sipholane triterpene