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1,3-dimethylxanthine
14C
14C dating
1,6-diaminohexane
18-electron rule
18O:16O ratio
1992
21-centimetre line
2,2,2-trichloroethanediol
2,3-dihydroxybutanedioic acid
2,4,5-T
2,4,6-trinitrophenol
2,4-D
2,4-dichlorophenoxyacetic acid
2-chlorobuta-1,3-diene
2-hydroxypropanoic acid
2-methylbuta-1,3-diene
2-methylpropenoic acid
30 Doradus
3,4,5-trihydroxybenzoic acid
3,7-dimethylxanthine
3blue1brown
3D camera
3D imaging
3D laser scanner
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