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In situ forming implants ( ISI ) prepared from biodegradable polymers such as poly ( D , L - lactide ) ( PLA ) and biocompatible solvents can be used to obtain sustained drug release after parenteral administration .
 poly ( D , L - lactide ), PLA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 poly ( D , L - lactide ), PLA