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