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Polyhydroxy pregnane glycoside ( PPG ) , a steroidal glycoside was isolated from Wattakaka volubilis Linn .
 Chemical: Polyhydroxy pregnane glycoside; Chemical: PPG; Chemical: steroidal glycoside
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: Polyhydroxy pregnane glycoside; Chemical: PPG; Chemical: steroidal glycoside