(2Z)-2-hydroxy-3-(4-hydroxyphenyl)acrylic acid 10589-28-3 2-Hydroxy-3-(4-hydroxy-phenyl)-acrylic acid 2-propenoic acid, 2-hydroxy-3-(4-hydroxyphenyl)-, (2Z)- 4,alpha-dihydroxy-cinnamic acid InChI=1/C9H8O4/c10-7-3-1-6(2-4-7)5-8(11)9(12)13/h1-5,10-11H,(H,12,13)/b8-5 p-Hydroxyphenylpyruvic acid