4-methyl-5-methylidene-4-phenyl-1,3-dioxolan-2-one

1-methyl-1-oxo-2,5-dihydro-1H-1λ5-phosphole-3-carboxylic acid

4,5-二氢-1-甲基-1H-磷杂环戊二烯-2-羧酸 1-氧化物

甲酰氯氟化物

4-phenoxybut-2-ynoic acid