tetrahydropyrimidine
tetrazolopyrimidine
hydroxypyrimidine
ethylpyrimidine
methylpyridine
alkylpyrimidine
dehydrotectol
tetrahydronicotinamide
trimethylpyridine
tetrahydrotriazine
tetrafluorophenyl
triarylpyridine
phenylpyridine
isophytol
tetrachlorophenol
tetrafluorobenzoquinone
proxyl
tetrahydroxyanthradione
trimesitic acid
MPTP
iodonitrotetrazolium
terpyridyl
tetramethylpiperidine
dimethylpyrrolidine
diaminopyridine
tetrachlorocyclohexene
HMX
benzoylpyridine
trimethylphenanthrene
quinalizarin
aurofusarin
ligustrazine
oxanol
alkylpyridine
isoxanthopterin
tetrachlorophenolphthalein
imidazotetrazine
diaminopyrimidine
oxane
pyrrolidinopentiophenone
methyltyrosine
alloxanthine
aryloxypyrimidine
silydianin
nitropyridine
methorphan
pyridinyl
homopterocarpin
tetrahydrouridine
acetylisoniazid