273
Optimized system with 15 % inner and outer coating levels revealed t ( 50 % ) ( time required for 50 % drug release ) to be about 9 h while almost complete drug was released in 24 h ( 98 . 71 +/- 1 . 33 % ) with highest dissolution efficiency ( DE ( 24h ) ) of 58 . 71 % .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None