Assertion: alkaloid | /r/HasProperty | classified into two broad categories
Facets:
value: based on chemical structures
type: OTHER
Source sentences:
text: Based on chemical structures, they may be classified into two broad categories: Non heterocyclic or atypical alkaloids, for example hordenine or N -methyltyramine, colchicine, and taxol Heterocyclic or typical alkaloids, for example quinine, caffeine, and nicotine