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1. ｵｶﾀﾞｻﾝ(ｵｶﾀﾞ酸):Ocadaic acid
2. ｵｷｻﾐﾙ:Oxamyl
3. ｵｷｻﾞﾛｻｸｻﾝ(ｵｷｻﾞﾛ酢酸):Oxalacetic acid
4. ｵｷｻｾﾞﾊﾟﾑ:Oxazepam
5. ｵｷｼﾃﾄﾗｻｲｸﾘﾝ:Oxytetracycline
6. ｵｷｼﾄｼﾝ:Oxytocin
7. ｵｷｼﾌｪﾝｻｲｸﾘﾐﾝ:Oxyphencyclimine
8. ｵｷｼﾝﾄﾞｳ(ｵｷｼﾝ銅):Oxine-Cu
9. ｵｷｿｼｸﾛﾍｷｼﾙﾒﾁﾙｱﾝｿｸｺｳｻﾝ(ｵｷｿｼｸﾛﾍｷｼﾙﾒﾁﾙ安息香酸):4-(1-Oxo-2-cyclohexylmethyl)benzoic acid
10. ｵｸﾀﾉｰﾙ:1-Octanol, 1-Caprylic alcohol
11. ｵｸﾀﾉﾌｪﾉﾝ:Octanophenone
12. ｵｸﾀﾝｻﾝ(ｵｸﾀﾝ酸):Octanoic acid, Caprylic acid
13. ｵｸﾁﾙﾌｪﾉｰﾙ:Octylphenol
14. ｵｸﾁﾙﾌｪﾉｰﾙｴﾄｷｼﾚ-ﾄ:Octylphenol ethoxylate, Polyoxyethylene octylphenyl ether
15. ｵﾎﾞｱﾙﾌﾞﾐﾝ:Ovalbumin
16. ｵﾘｺﾞｱﾃﾞﾆﾙｻﾝ(ｵﾘｺﾞｱﾃﾞﾆﾙ酸):Oligoadenylic acids
17. ｵﾘｺﾞｶﾞﾗｸﾂﾛﾝｻﾝ(ｵﾘｺﾞｶﾞﾗｸﾂﾛﾝ酸):Oligogalacturonic acids
18. ｵﾘｺﾞﾃﾞｵｷｼﾘﾎﾞﾇｸﾚｵﾁﾄﾞ:Oligodeoxyribonucleotide
19. ｵﾙﾆﾁﾝ:Ornithine, Orn
20. ｵﾚｲﾝｻﾝ(ｵﾚｲﾝ酸):Oleic acid
21. ｵﾚｲﾝｻﾝﾒﾁﾙ(ｵﾚｲﾝ酸ﾒﾁﾙ):Methyl oleate
22. ｵﾚﾝｼﾞ:Orange
23. ｵﾛﾁｼﾞﾝ:Orotidine
24. ｵﾛﾁﾝｻﾝ(ｵﾛﾁﾝ酸):Orotic acid, Vitamin B₁₃