齐墩果酸, Oleanolic Acid

L-鸟氨酸盐酸盐, L-Ornithine hydrochloride

氧化锇(IV), Osmium(IV) oxide

2-氧杂-6-氮杂螺[3.4]辛烷, 2-Oxa-6-azaspiro[3.4]octane

草酸, Oxalic acid

草氨酸钠, Oxamic acid sodium salt

奥卡西平, Oxcarbazepine

3-Oxobutanenitrile

Oxone®

钯,0.5%负载于 2-4 mm 氧化铝球, Palladium,0.5% on 2-4 mm alumina spheres