3-(2,4-dihydroxyphenyl)prop-2-enoic acid (E)-3-(2,4-dihydroxyphenyl)prop-2-enoic acid 3-(2,4-dihydroxyphenyl)acrylic acid (E)-3-(2,4-dihydroxyphenyl)acrylic acid SBB008560 2,4-Dihydroxycinnamic acid 663158_ALDRICH (E)-3-(2,4-dihydroxyphenyl)prop-2-enoate