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Six biodegradable polymers have been investigated as drug carriers using molecular simulations : l - polylactide , d - polylactide , chitosan , polyglycolic acid , polyethylene glycol and cellulose .
 Chemical: l - polylactide; Chemical: d - polylactide; Chemical: polyglycolic acid; Chemical: polyethylene glycol
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: l - polylactide; Chemical: d - polylactide; Chemical: polyglycolic acid; Chemical: polyethylene glycol