22137
Synthesis and Biological Evaluation of a New Series of Hexahydro - 2H - pyrano [ 3 , 2 - c ] quinolines as Novel Selective sigma 1 Receptor Ligands .
 Chemical: Hexahydro - 2H - pyrano [ 3 , 2 - c ] quinolines
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: Hexahydro - 2H - pyrano [ 3 , 2 - c ] quinolines