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L - 3 , 4 - Dihydroxyphenylalanine ( L - DOPA ) remains the most effective symptomatic treatment of Parkinson ' s disease ( PD ) .
 Chemical: L - 3 , 4 - Dihydroxyphenylalanine; Chemical: L - DOPA
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 - 3 , 4 - Dihydroxyphenylalanine; Chemical: L - DOPA