the specific chemical and physical characteristics necessary for a substance to exhibit a certain biological activity
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C18H24O4
1,3,4-Oxathiazol-2-one, 5-[3,5-bis(1,1-dimethylethyl)-4-hydroxyphenyl]-
2',6'-DIHYDROXY-4'-METHOXYCHALCONE
Pyridine, 1,2,3,6-tetrahydro-4-(4-methoxyphenyl)-1-methyl-