嘧啶-5-硼酸频哪酯, Pyrimidine-5-boronic acid pinacol ester

黄铁矿, Pyrite

吡咯-2-甲酸, Pyrrole-2-carboxylic Acid

4-吡咯烷丁胺, 4-(1-Pyrrolidinyl)-1-butylamine

3-吡咯啉, 3-Pyrroline

喹哪啶红, Quinaldine Red

喹啉-4-甲醛, Quinoline-4-carboxaldehyde

对五联苯, p-Quinquephenyl

氯化铼(V), Rhenium(V) chloride

罗丹宁, Rhodanine

乙酸铑(II)二聚物, Rhodium(II) acetate

无水氧化铑(III), Rhodium(III) oxide

蔷薇酸, Rosolic acid

甲酸铷水合物, Rubidium formate hydrate

钌,0.5%负载于颗粒碳, Ruthenium,0.5% on granular carbon