22690
Specifically , at least two alkaloids isolated from the plant Mitragyna speciosa , mitragynine ( ( E ) - 2 - [ ( 2S , 3S ) - 3 - ethyl - 8 - methoxy - 1 , 2 , 3 , 4 , 6 , 7 , 12 , 12b - octahydroindolo [ 3 , 2 - h ] quinolizin - 2 - yl ] - 3 - methoxyprop - 2 - enoic acid methyl ester ; 9 - methoxy coryantheidine ; MG ) and 7 - hydroxymitragynine ( 7 - OH - MG ) , and several synthetic analogues of these natural products display centrally mediated ( supraspinal and spinal ) antinociceptive ( analgesic ) activity in various pain models .
 Chemical: mitragynine; Chemical: ( E ) - 2 - [ ( 2S , 3S ) - 3 - ethyl - 8 - methoxy - 1 , 2 , 3 , 4 , 6 , 7 , 12 , 12b - octahydroindolo [ 3 , 2 - h ] quinolizin - 2 - yl ] - 3 - methoxyprop - 2 - enoic acid methyl ester; Chemical: 9 - methoxy coryantheidine; Chemical: 7 - hydroxymitragynine; Chemical: 7 - OH - MG
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: mitragynine; Chemical: ( E ) - 2 - [ ( 2S , 3S ) - 3 - ethyl - 8 - methoxy - 1 , 2 , 3 , 4 , 6 , 7 , 12 , 12b - octahydroindolo [ 3 , 2 - h ] quinolizin - 2 - yl ] - 3 - methoxyprop - 2 - enoic acid methyl ester; Chemical: 9 - methoxy coryantheidine; Chemical: 7 - hydroxymitragynine; Chemical: 7 - OH - MG