2992
The quinolizidine alkaloids ( natural products ) such as oxymatrine , sophoridine , sophocarpine and matrine carry the common molecular structure of O = C = N - C - C - C - N that possessed positive ionotropic effect and hERG blocking activity .
 Chemical: quinolizidine alkaloids; Chemical: oxymatrine; Chemical: sophoridine; Chemical: sophocarpine; Chemical: matrine; Chemical: O = C = N - C - C - C - N
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: quinolizidine alkaloids; Chemical: oxymatrine; Chemical: sophoridine; Chemical: sophocarpine; Chemical: matrine; Chemical: O = C = N - C - C - C - N