alkaloid
amphotere
amphoteric
aromatic
atomic
atoms
bond
chemical
chemistry
circle
circles
composition
compound
diazole
formula
heterocycle
histamine
histidine
imidazol
imidazole
imidazoles
imidazolide
imidazolium
ionic
line
liquid
model
molecular
molecule
nickel
organic
skeletal
structural
structure