22138
The synthesis and pharmacological activity of a new series of hexahydro - 2H - pyrano [ 3 , 2 - c ] quinoline derivatives as potent sigma 1 receptor ( sigma 1R ) ligands are reported .
 Chemical: hexahydro - 2H - pyrano [ 3 , 2 - c ] quinoline
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: hexahydro - 2H - pyrano [ 3 , 2 - c ] quinoline