3720
Dextromethorphan ( DM ) , the dextrorotatory isomer of 3 - hydroxy - N - methylmorphinan , is the main ingredient in a number of widely available , over - the - counter antitussives .
 Chemical: Dextromethorphan; Chemical: DM; Chemical: 3 - hydroxy - N - methylmorphinan
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: Dextromethorphan; Chemical: DM; Chemical: 3 - hydroxy - N - methylmorphinan